Numbers and Algebra

Indices - Powers and bases

By the end of the lesson, the learner should be able to:

- Identify the base and power in index notation
- Express numbers as products of prime factors in index form
- Relate index form to expressing large numbers like population figures

- Write numbers as products of repeated factors
- Express products in index form identifying base and power
- Discuss how index notation simplifies large numbers

How are the laws of indices applied in real life?

- Mentor Essential Mathematics pg. 13
- Number cards
- Charts on indices

- Oral questions - Written exercises - Observation

Numbers and Algebra

Indices - Expressing numbers in index form
Indices - Multiplication law

By the end of the lesson, the learner should be able to:

- Express whole numbers in simplest index form
- Express fractions in index form
- Apply index notation to scientific measurements and data

- Break down numbers into prime factors and express in index form
- Express fractions with numerator and denominator in index form
- Search for population data and express in index form

Why are indices important?

- Mentor Essential Mathematics pg. 14
- Calculators
- Digital resources
- Mentor Essential Mathematics pg. 15
- Index law charts
- Calculators

- Written exercises - Class activities - Oral questions

Numbers and Algebra

Indices - Division law

By the end of the lesson, the learner should be able to:

- State the division law of indices
- Apply the division law to simplify expressions
- Relate division of indices to sharing and distribution problems

- Divide numbers with the same base by subtracting powers
- Simplify expressions using the division law
- Solve problems on distributing items among groups

How are the laws of indices applied in real life?

- Mentor Essential Mathematics pg. 16
- Index law charts
- Calculators

- Written tests - Class activities - Observation

Numbers and Algebra

Indices - Power of a power
Indices - Zero index

By the end of the lesson, the learner should be able to:

- State the power of a power law
- Apply the law to simplify expressions with powers raised to powers
- Apply the law to compound growth calculations

- Expand expressions with powers of powers
- Multiply indices when a power is raised to another power
- Discuss applications in compound interest calculations

How are the laws of indices applied in real life?

- Mentor Essential Mathematics pg. 17
- Index law charts
- Calculators
- Mentor Essential Mathematics pg. 18
- Calculators
- Index law charts

- Written exercises - Class activities - Oral questions

Numbers and Algebra

Indices - Applying laws of indices
Indices - Applying laws of indices in numerical computations

By the end of the lesson, the learner should be able to:

- Apply multiple laws of indices in computations
- Simplify complex expressions using combined laws
- Apply indices to scientific notation and large number calculations

- Work out computations requiring multiple index laws
- Simplify expressions with mixed operations
- Use digital resources to explore applications of indices

How are the laws of indices applied in real life?

- Mentor Essential Mathematics pg. 19
- Calculators
- Digital devices
- Digital resources

- Written tests - Class activities - Portfolio

Numbers and Algebra

Indices - Problem solving with indices

By the end of the lesson, the learner should be able to:

- Apply indices to solve practical problems
- Work collaboratively to solve index problems
- Connect indices to technological applications like data storage

- Work with peers on practical problems involving indices
- Present solutions and discuss different approaches
- Research applications of indices in computer memory and data

Why are indices important?

- Mentor Essential Mathematics pg. 20
- Digital devices
- Calculators

- Portfolio - Observation - Written tests

Numbers and Algebra

Quadratic Equations - Formation of algebraic expressions
Quadratic Equations - Formation of algebraic expressions from real life

By the end of the lesson, the learner should be able to:

- Form algebraic expressions from word statements
- Use letters to represent unknown quantities
- Relate algebraic expressions to real situations like shopping and measurements

- Read case scenarios and form algebraic expressions
- Use letters to represent unknown quantities
- Discuss how expressions represent real-life situations

How are quadratic equations applied in real life?

- Mentor Essential Mathematics pg. 21
- Word problem cards
- Charts
- Mentor Essential Mathematics pg. 22
- Calculators

- Oral questions - Written exercises - Observation

Numbers and Algebra

Quadratic Equations - Formation of quadratic expressions
Quadratic Equations - Quadratic expressions from real life situations

By the end of the lesson, the learner should be able to:

- Identify quadratic expressions
- Form quadratic expressions by multiplying binomials
- Relate quadratic expressions to calculating areas of rectangles

- Expand products of two binomials
- Identify the structure of quadratic expressions
- Discuss how quadratic expressions represent area problems

How are quadratic equations applied in real life?

- Mentor Essential Mathematics pg. 23
- Rectangular cut-outs
- Charts
- Mentor Essential Mathematics pg. 24
- Diagram charts
- Graph paper

- Oral questions - Written exercises - Observation

Numbers and Algebra

Quadratic Equations - Formation of quadratic equations

By the end of the lesson, the learner should be able to:

- Distinguish between quadratic expressions and equations
- Form quadratic equations from given conditions
- Apply quadratic equations to problems on area and dimensions

- Form quadratic equations from area problems
- Set up equations where expression equals a given value
- Discuss volleyball pitch and room dimension problems

How are quadratic equations applied in real life?

- Mentor Essential Mathematics pg. 25
- Diagram charts
- Calculators

- Written exercises - Class activities - Oral questions

Numbers and Algebra

Quadratic Equations - Quadratic equations from word problems
Quadratic Equations - Factorisation of quadratic expressions

By the end of the lesson, the learner should be able to:

- Form quadratic equations from various word problems
- Interpret real-life situations as quadratic equations
- Model age, product and sharing problems using quadratic equations

- Read and interpret word problems
- Form quadratic equations from age and product problems
- Discuss seedbed and carpet area problems

How are quadratic equations applied in real life?

- Mentor Essential Mathematics pg. 26
- Word problem cards
- Calculators
- Mentor Essential Mathematics pg. 27
- Factor pair charts

- Written tests - Class activities - Portfolio

Numbers and Algebra

Quadratic Equations - Factorisation by grouping
Quadratic Equations - Factorisation of expressions ax² + bx + c

By the end of the lesson, the learner should be able to:

- Factorise quadratic expressions by grouping
- Apply the grouping method to various expressions
- Verify factorisation by expanding the factors

- Split the middle term into two terms
- Group terms and factorise each group
- Extract the common factor and complete factorisation

How are quadratic equations applied in real life?

- Mentor Essential Mathematics pg. 27
- Worked examples charts
- Calculators
- Mentor Essential Mathematics pg. 28
- Factor charts

- Written exercises - Class activities - Oral questions

Numbers and Algebra

Quadratic Equations - Solving by factorisation

By the end of the lesson, the learner should be able to:

- Apply factorisation to solve quadratic equations
- Find solutions by equating each factor to zero
- Verify solutions by substitution into the original equation

- Factorise the quadratic expression
- Set each factor equal to zero and solve for x
- Check solutions by substituting back into the equation

How are quadratic equations applied in real life?

- Mentor Essential Mathematics pg. 28
- Worked examples charts
- Calculators

- Written exercises - Class activities - Oral questions

Numbers and Algebra

Quadratic Equations - Solving equations with repeated roots
Quadratic Equations - Applications to real life problems

By the end of the lesson, the learner should be able to:

- Solve quadratic equations with repeated roots
- Identify perfect square trinomials
- Interpret the meaning of repeated roots in context

- Factorise perfect square trinomials
- Solve equations yielding single solutions
- Discuss what repeated roots mean in area problems

How are quadratic equations applied in real life?

- Mentor Essential Mathematics pg. 29
- Calculators
- Worked examples
- Diagram charts
- Calculators

- Oral questions - Written exercises - Observation

Measurements and Geometry

Similarity and Enlargement - Properties of similar figures
Similarity and Enlargement - Centre of enlargement and linear scale factor
Similarity and Enlargement - Linear scale factor

By the end of the lesson, the learner should be able to:

- Identify properties of similar figures
- Compare corresponding sides and angles of similar figures
- Relate similarity to real life objects like photographs and maps

- Collect objects from the environment and sort similar objects together
- Measure corresponding sides of similar triangles and determine ratios
- Measure corresponding angles of similar figures
- Discuss reasons why objects are considered similar

How do we identify similar figures in our environment?

- Mentor Essential Mathematics pg. 31
- Similar objects (containers, shapes)
- Rulers and protractors
- Digital resources
- Mentor Essential Mathematics pg. 33
- Protractors
- Rulers
- Cut-outs of similar shapes
- Mentor Essential Mathematics pg. 37
- Plain paper
- Pencils
- Mentor Essential Mathematics pg. 38
- Graph paper
- Calculators

- Observation - Oral questions - Written assignments

Measurements and Geometry

Similarity and Enlargement - Drawing images under enlargement
Similarity and Enlargement - Drawing images on Cartesian plane
Similarity and Enlargement - Area scale factor

By the end of the lesson, the learner should be able to:

- Draw the image of an object given centre and scale factor
- Construct enlarged images accurately
- Connect enlargement to photocopying and image resizing

- Draw objects on Cartesian plane
- Use given centre and scale factor to locate image points
- Construct images under different scale factors
- Compare object and image dimensions

How do we draw an image under enlargement?

- Mentor Essential Mathematics pg. 40
- Graph paper
- Rulers
- Geometrical instruments
- Mentor Essential Mathematics pg. 41
- Pencils
- Mentor Essential Mathematics pg. 42
- Calculators
- Rulers

- Observation - Practical work - Written assignments

Measurements and Geometry

Similarity and Enlargement - Area scale factor calculations
Similarity and Enlargement - Volume scale factor

By the end of the lesson, the learner should be able to:

- Calculate area scale factor from given measurements
- Apply area scale factor formula
- Use area scale factor in calculating painting and carpeting costs

- Work out area scale factors for various similar figures
- Solve problems involving area scale factor
- Apply area scale factor to real-life scenarios
- Share solutions with peers

How is area scale factor applied in real life?

- Mentor Essential Mathematics pg. 44
- Calculators
- Rulers
- Digital resources
- Mentor Essential Mathematics pg. 43
- Similar containers
- Calculators

- Observation - Oral questions - Written tests

Measurements and Geometry

Similarity and Enlargement - Relating linear, area and volume scale factors
Similarity and Enlargement - Application to area

By the end of the lesson, the learner should be able to:

- Relate linear scale factor to area and volume scale factors
- Convert between different scale factors
- Apply scale factor relationships to model making and engineering

- Make similar cylinders of different sizes
- Calculate ratios of heights, areas, and volumes
- Compare the three ratios and establish relationships
- Solve problems involving all three scale factors

How are the three scale factors related?

- Mentor Essential Mathematics pg. 45
- Manila paper
- Calculators
- Scissors
- Mentor Essential Mathematics pg. 46
- Digital resources
- Reference books

- Observation - Oral questions - Written tests

Measurements and Geometry

Similarity and Enlargement - Application to volume
Reflection - Lines of symmetry in plane figures
Reflection - Lines of symmetry in regular polygons

By the end of the lesson, the learner should be able to:

- Apply linear scale factor to find volumes of similar objects
- Solve problems on volume using scale factors
- Use similarity in estimating storage capacities and tank volumes

- Calculate volumes of similar solids using scale factors
- Solve word problems involving volume scale factor
- Complete project on making similar containers
- Document processes and take pictures

How do we apply volume scale factor to solve problems?

- Mentor Essential Mathematics pg. 47
- Calculators
- Manila paper
- Locally available materials
- Mentor Essential Mathematics pg. 50
- Paper cut-outs
- Scissors
- Various 2D objects
- Mentor Essential Mathematics pg. 52
- Rulers
- Protractors
- Plain paper

- Observation - Project assessment - Written tests

Measurements and Geometry

Reflection - Properties of reflection
Reflection - Drawing images given object and mirror line
Reflection - Reflection along x = 0
Reflection - Reflection along y = 0

By the end of the lesson, the learner should be able to:

- Determine the properties of reflection using objects and images
- Compare distances of object and image from mirror line
- Relate reflection properties to how mirrors work in daily life

- Observe triangle ABC and its image A'B'C' after reflection
- Compare sizes and shapes of object and image
- Measure and compare distances from mirror line
- Stand at different distances from plane mirror and observe

What are the properties of reflection?

- Mentor Essential Mathematics pg. 53
- Plane mirrors
- Rulers
- Plain paper
- Mentor Essential Mathematics pg. 54
- Plain paper
- Set squares
- Mentor Essential Mathematics pg. 56
- Graph paper
- Pencils
- Mentor Essential Mathematics pg. 58
- Calculators

- Observation - Oral questions - Written assignments

Measurements and Geometry

Reflection - Reflection along y = x
Reflection - Drawing mirror line given object and image on plane surface
Reflection - Drawing mirror line on Cartesian plane

By the end of the lesson, the learner should be able to:

- Draw an image after reflection along the line y = x
- Determine coordinates of image points when reflected along y = x
- Use reflection in creating tessellations and artistic patterns

- Plot triangles on Cartesian plane
- Draw line y = x and reflect points
- Record and compare coordinates
- Establish the rule for reflection along y = x

What happens to coordinates when reflecting along y = x?

- Mentor Essential Mathematics pg. 57
- Graph paper
- Rulers
- Pencils
- Mentor Essential Mathematics pg. 60
- Plain paper
- Compasses
- Mentor Essential Mathematics pg. 61

- Observation - Practical work - Written assignments

Measurements and Geometry

Reflection - Application in real life situations
Trigonometry - Identifying sides of a right-angled triangle

By the end of the lesson, the learner should be able to:

- Apply reflection in real-life situations
- Solve problems involving reflection
- Use reflection concepts in understanding driving mirrors and road safety

- Discuss uses of reflection in real life
- Solve problems involving town layouts and architectural designs
- Work with peers to apply reflection to practical situations
- Present findings to class

How is reflection used in day-to-day activities?

- Mentor Essential Mathematics pg. 63
- Graph paper
- Rulers
- Digital resources
- Mentor Essential Mathematics pg. 65
- Ladders
- Protractors
- Rulers

- Observation - Oral questions - Written tests

Measurements and Geometry

Trigonometry - Tangent ratio
Trigonometry - Applications of tangent ratio
Trigonometry - Sine ratio
Trigonometry - Applications of sine ratio

By the end of the lesson, the learner should be able to:

- Determine the tangent of acute angles in a right-angled triangle
- Calculate tangent ratios from given measurements
- Apply tangent ratio in calculating heights and distances in surveying

- Measure opposite and adjacent sides in similar triangles
- Calculate ratio of opposite to adjacent for angle θ
- Record ratios and observe that they are constant
- Work out tangent of angles in various triangles

What is the tangent of an angle?

- Mentor Essential Mathematics pg. 67
- Rulers
- Protractors
- Calculators
- Mentor Essential Mathematics pg. 68
- Calculators
- Reference books
- Mentor Essential Mathematics pg. 69
- Mentor Essential Mathematics pg. 71
- Digital resources

- Observation - Oral questions - Written tests

Measurements and Geometry

Trigonometry - Cosine ratio
Trigonometry - Applications of cosine ratio
Trigonometry - Sines and cosines of complementary angles

By the end of the lesson, the learner should be able to:

- Determine the cosine of acute angles in a right-angled triangle
- Calculate cosine ratios from given measurements
- Apply cosine ratio to navigation and distance calculations

- Measure adjacent side and hypotenuse in similar triangles
- Calculate ratio of adjacent to hypotenuse for angle θ
- Observe that the ratio is constant for the same angle
- Work out cosine of angles in various triangles

What is the cosine of an angle?

- Mentor Essential Mathematics pg. 72
- Rulers
- Protractors
- Calculators
- Mentor Essential Mathematics pg. 74
- Calculators
- Reference books
- Mentor Essential Mathematics pg. 75
- Scientific calculators
- Reference books
- Digital resources

- Observation - Oral questions - Written tests

Measurements and Geometry

Trigonometry - Solving equations involving complementary angles
Trigonometry - Making a clinometer

By the end of the lesson, the learner should be able to:

- Solve equations involving sines and cosines of complementary angles
- Apply the relationship sin θ = cos(90°-θ)
- Use complementary angle properties in practical calculations

- Solve equations like sin θ = cos 40°
- Work out problems involving sin(x-55) = cos x
- Apply complementary angle relationships
- Share solutions with peers

How do we solve equations involving complementary angles?

- Mentor Essential Mathematics pg. 76
- Scientific calculators
- Exercise books
- Reference books
- Mentor Essential Mathematics pg. 77
- Manila paper
- Blackboard protractor
- String and weight

- Observation - Oral questions - Written assignments

Measurements and Geometry

Trigonometry - Angle of elevation
Trigonometry - Problems on angle of elevation

By the end of the lesson, the learner should be able to:

- Apply trigonometric ratios to angles of elevation
- Calculate heights using angles of elevation
- Use angle of elevation in determining heights of flagpoles, trees and buildings

- Use clinometer to measure angle of elevation of tall objects
- Measure horizontal distance from object
- Apply trigonometric ratios to calculate heights
- Compare calculated heights with actual measurements

How do we use angles of elevation to find heights?

- Mentor Essential Mathematics pg. 79
- Clinometers
- Tape measures
- Calculators
- Mentor Essential Mathematics pg. 80
- Calculators
- Rulers
- Exercise books

- Observation - Practical work - Written tests

Measurements and Geometry

Trigonometry - Angle of depression

By the end of the lesson, the learner should be able to:

- Apply trigonometric ratios to angles of depression
- Calculate distances using angles of depression
- Use angle of depression in aviation and marine navigation

- Discuss meaning of angle of depression
- Draw diagrams showing angles of depression
- Apply trigonometric ratios to find distances
- Solve problems involving observers on cliffs and buildings

How do we use angles of depression to find distances?

- Mentor Essential Mathematics pg. 80
- Calculators
- Rulers
- Digital resources

- Observation - Oral questions - Written tests

Measurements and Geometry

Trigonometry - Application in real life situations
Area of Polygons - Area of triangle given two sides and an included angle
Area of Polygons - Problems on area of triangle

By the end of the lesson, the learner should be able to:

- Solve combined problems on angles of elevation and depression
- Apply trigonometry to various real-life scenarios
- Use trigonometry in determining distances between ships, aircraft heights and building measurements

- Solve problems involving two ships viewed from cliff
- Calculate distances and heights in combined scenarios
- Use digital resources to explore more applications
- Present solutions to class

How is trigonometry used in real life?

- Mentor Essential Mathematics pg. 81
- Calculators
- Digital resources
- Reference books
- Mentor Essential Mathematics pg. 84
- Rulers
- Protractors
- Calculators
- Mentor Essential Mathematics pg. 85
- Exercise books

- Observation - Oral questions - Written assignments

Measurements and Geometry

Area of Polygons - Heron's Formula
Area of Polygons - Problems using Heron's Formula
Area of Polygons - Area of a rhombus
Area of Polygons - Area of rhombus given side and angle

By the end of the lesson, the learner should be able to:

- Determine the area of a triangle given three sides using Heron's Formula
- Calculate semi-perimeter of triangles
- Apply Heron's formula to irregular triangular plots and badges

- Draw right-angled triangle with given measurements
- Calculate perimeter and semi-perimeter
- Apply Heron's formula: √[s(s-a)(s-b)(s-c)]
- Compare with area calculated using other methods

How do we find the area of a triangle using Heron's Formula?

- Mentor Essential Mathematics pg. 86
- Calculators
- Rulers
- Scientific calculators
- Mentor Essential Mathematics pg. 87
- Exercise books
- Reference books
- Mentor Essential Mathematics pg. 88
- Protractors
- Calculators
- Mentor Essential Mathematics pg. 89
- Protractors

- Observation - Oral questions - Written assignments

Measurements and Geometry

Area of Polygons - Area of a parallelogram
Area of Polygons - Area of parallelogram using ab sin θ
Area of Polygons - Area of a regular pentagon

By the end of the lesson, the learner should be able to:

- Determine the area of a parallelogram
- Apply the formula Area = base × perpendicular height
- Calculate areas of parallelogram-shaped solar panels and floor plans

- Draw parallelogram with given dimensions
- Calculate perpendicular height using trigonometry
- Apply formula: base × perpendicular height
- Work out areas of various parallelograms

How do we find the area of a parallelogram?

- Mentor Essential Mathematics pg. 92
- Rulers
- Protractors
- Calculators
- Mentor Essential Mathematics pg. 94
- Calculators
- Exercise books
- Mentor Essential Mathematics pg. 95

- Observation - Oral questions - Written assignments

Measurements and Geometry

Area of Polygons - Problems on area of pentagon

By the end of the lesson, the learner should be able to:

- Solve problems on area of regular pentagons
- Calculate areas of pentagon-shaped objects
- Apply pentagon area to trampoline covers and decorative designs

- Calculate area of pentagon-shaped flower beds
- Work out area of pizza box lids
- Solve problems involving pentagon-shaped objects
- Present solutions to class

How is area of pentagon applied in real life?

- Mentor Essential Mathematics pg. 97
- Calculators
- Exercise books
- Digital resources

- Observation - Oral questions - Written tests

Measurements and Geometry

Area of Polygons - Area of a regular hexagon
Area of Polygons - Application in real life situations
Area of a Part of a Circle - Area of a sector

By the end of the lesson, the learner should be able to:

- Determine the area of a regular hexagon
- Divide hexagon into 6 triangles and calculate total area
- Apply hexagon area to floor tiling and road sign designs

- Draw regular hexagon and divide into 6 triangles
- Measure radius from centre to vertex
- Calculate area of one triangle
- Multiply by 6 to get total area

How do we find the area of a regular hexagon?

- Mentor Essential Mathematics pg. 96
- Rulers
- Protractors
- Calculators
- Mentor Essential Mathematics pg. 98
- Calculators
- Digital resources
- Reference books
- Mentor Essential Mathematics pg. 101
- Compasses

- Observation - Oral questions - Written assignments

Measurements and Geometry

Area of a Part of a Circle - Problems on area of sector
Area of a Part of a Circle - Area of a segment
Area of a Part of a Circle - Problems on area of segment

By the end of the lesson, the learner should be able to:

- Solve problems on area of sectors
- Find radius or angle when area is given
- Apply sector area to garden sprinklers and billboard sections

- Calculate area of sector-shaped artisan designs
- Work out angle when area and radius are given
- Determine radius when area and angle are given
- Present solutions to peers

How do we solve problems involving sectors?

- Mentor Essential Mathematics pg. 102
- Calculators
- Rulers
- Exercise books
- Mentor Essential Mathematics pg. 103
- Compasses
- Protractors
- Calculators
- Mentor Essential Mathematics pg. 105
- Exercise books
- Reference books

- Observation - Oral questions - Written tests

Measurements and Geometry

Area of a Part of a Circle - Area swept by gate
Area of a Part of a Circle - Problems on curved paths and decorations
Area of a Part of a Circle - Clock and sprinkler problems

By the end of the lesson, the learner should be able to:

- Apply area of sector to find area swept by rotating objects
- Calculate area covered by opening gates and doors
- Use sector area in clock hand problems and fan blade designs

- Observe area covered by gate when it opens
- Measure angle of rotation and length of gate
- Calculate area swept using sector formula
- Discuss other applications

How do we calculate area swept by rotating objects?

- Mentor Essential Mathematics pg. 107
- Tape measures
- Protractors
- Calculators
- Mentor Essential Mathematics pg. 108
- Calculators
- Rulers
- Digital resources
- Mentor Essential Mathematics pg. 110
- Clocks
- Reference books

- Observation - Practical work - Written assignments

Measurements and Geometry

Area of a Part of a Circle - Combined problems
Surface Area of Solids - Nets of cones
Surface Area of Solids - Surface area of a cone from its net
Surface Area of Solids - Surface area of cone using formula

By the end of the lesson, the learner should be able to:

- Solve combined problems on sectors and segments
- Apply area of parts of circles in various contexts
- Use concepts in calculating metal sheet areas and flower garden segments

- Calculate area of metal sheet in segment shape
- Work out area of flower segments in circular gardens
- Solve problems on staffroom doors and gates
- Review all concepts on area of parts of circles

Where do we use area of part of a circle in real life?

- Mentor Essential Mathematics pg. 111
- Calculators
- Exercise books
- Digital resources
- Mentor Essential Mathematics pg. 112
- Manila paper
- Scissors
- Cone-shaped objects
- Mentor Essential Mathematics pg. 113
- Cone nets
- Protractors
- Calculators
- Mentor Essential Mathematics pg. 114
- Reference books

- Observation - Oral questions - Written tests

Measurements and Geometry

Surface Area of Solids - Nets of pyramids
Surface Area of Solids - Surface area of square-based pyramid
Surface Area of Solids - Surface area of rectangular-based pyramid

By the end of the lesson, the learner should be able to:

- Identify nets of square and rectangular-based pyramids
- Draw nets of pyramids
- Connect pyramid shapes to monuments, roof structures and tent designs

- Make models of square and rectangular-based pyramids
- Cut and open pyramids along edges to get nets
- Measure edges and slant heights
- Identify base and triangular faces in nets

What shapes make up the net of a pyramid?

- Mentor Essential Mathematics pg. 115
- Manila paper
- Scissors
- Rulers
- Mentor Essential Mathematics pg. 116
- Graph paper
- Calculators
- Mentor Essential Mathematics pg. 117

- Observation - Practical work - Written tests

Measurements and Geometry

Surface Area of Solids - Surface area of a sphere
Surface Area of Solids - Surface area of a hemisphere
Surface Area of Solids - Surface area of frustum of a cone

By the end of the lesson, the learner should be able to:

- Calculate the surface area of a sphere
- Apply the formula 4πr²
- Use sphere surface area in calculating material for balls, globes and decorative spheres

- Collect spherical objects (soccer balls, marbles, oranges)
- Estimate and record radius of each object
- Calculate surface area using formula 4πr²
- Share work with other groups

How do we find the surface area of a sphere?

- Mentor Essential Mathematics pg. 120
- Spherical objects
- Rulers
- Calculators
- Mentor Essential Mathematics pg. 121
- Oranges
- Knives
- Mentor Essential Mathematics pg. 122
- Manila paper
- Scissors

- Observation - Oral questions - Written assignments

Measurements and Geometry

Surface Area of Solids - Problems on frustum of a cone
Surface Area of Solids - Surface area of frustum of a pyramid

By the end of the lesson, the learner should be able to:

- Solve problems on surface area of frustums of cones
- Calculate surface areas of open and closed frustums
- Apply to coffee cups, loudspeaker diaphragms and chemical storage buckets

- Calculate total surface area: πL(R+r) + πR² + πr²
- Work out surface area of open-top coffee cups
- Calculate curved surface area of loudspeaker diaphragms
- Solve problems on buckets storing chemicals

How do we solve problems on frustum surface area?

- Mentor Essential Mathematics pg. 124
- Calculators
- Exercise books
- Reference books
- Mentor Essential Mathematics pg. 125
- Manila paper
- Scissors
- Calculators

- Observation - Oral questions - Written tests

Measurements and Geometry

Surface Area of Solids - Problems on frustum of a pyramid
Volume and Capacity - Volume of a cone

By the end of the lesson, the learner should be able to:

- Solve problems on surface area of frustums of pyramids
- Calculate surface area of rectangular-based pyramid frustums
- Apply to hollow lampshades, counter designs, statue stands and open water tanks

- Calculate areas of trapezoidal faces for rectangular-based frustums
- Work out surface area of hollow lampshades (lateral only)
- Solve problems on counters and statue stands
- Determine material needed for multiple lampshades

How are frustums of pyramids used in real life?

- Mentor Essential Mathematics pg. 127
- Calculators
- Exercise books
- Digital resources
- Mentor Essential Mathematics pg. 132
- Manila paper
- Sand
- Calculators

- Observation - Oral questions - Written tests

Measurements and Geometry

Volume and Capacity - Problems on volume of cones
Volume and Capacity - Volume of cone given slant height
Volume and Capacity - Volume of a pyramid
Volume and Capacity - Problems on volume of pyramids

By the end of the lesson, the learner should be able to:

- Calculate volume of cones given dimensions
- Determine capacity of cone-shaped containers
- Apply cone volume to funnel designs and conical flasks in laboratories

- Calculate volume of cone-shaped containers
- Convert volume to capacity in litres
- Work out radius or height when volume is given
- Solve problems on ice cream cones and funnels

How do we calculate the capacity of a cone?

- Mentor Essential Mathematics pg. 133
- Calculators
- Exercise books
- Reference books
- Mentor Essential Mathematics pg. 134
- Rulers
- Exercise books
- Mentor Essential Mathematics pg. 135
- Pyramid models
- Calculators
- Mentor Essential Mathematics pg. 136

- Observation - Oral questions - Written tests

Measurements and Geometry

Volume and Capacity - Volume of frustum of a cone
Volume and Capacity - Problems on frustum of a cone
Volume and Capacity - Volume of frustum of a pyramid

By the end of the lesson, the learner should be able to:

- Determine volume of frustum of a cone
- Calculate volume by subtracting smaller cone from larger cone
- Apply to bucket designs and lampshade constructions

- Make model of cone and cut parallel to base
- Measure radii and heights of both cones
- Calculate volumes of original and cut-off cones
- Subtract to get volume of frustum

How do we find volume of a frustum of a cone?

- Mentor Essential Mathematics pg. 138
- Manila paper
- Scissors
- Calculators
- Mentor Essential Mathematics pg. 140
- Calculators
- Exercise books
- Digital resources
- Mentor Essential Mathematics pg. 142

- Observation - Practical work - Written tests

Measurements and Geometry

Volume and Capacity - Problems on frustum of a pyramid
Volume and Capacity - Volume of composite solids

By the end of the lesson, the learner should be able to:

- Solve problems on volume of frustum of a pyramid
- Calculate capacity of pyramid frustum containers
- Apply to water troughs, flower vases and lunch boxes

- Calculate volume of water troughs cut from pyramids
- Work out capacity of traditional woven baskets
- Determine volume of flower vases and lunch boxes
- Convert to litres and millilitres

How is frustum of pyramid volume applied?

- Mentor Essential Mathematics pg. 144
- Calculators
- Exercise books
- Reference books
- Mentor Essential Mathematics pg. 145
- Models of solids
- Digital resources

- Observation - Oral questions - Written assignments

Measurements and Geometry

Volume and Capacity - Capacity problems
Volume and Capacity - Combined problems

By the end of the lesson, the learner should be able to:

- Convert between volume and capacity units
- Solve problems involving litres and millilitres
- Apply to water storage, milk packaging and fuel tank capacities

- Convert cubic metres to litres
- Convert cubic centimetres to millilitres
- Calculate capacity of various containers
- Solve real-life problems on water and fuel storage

Why is the knowledge of volume and capacity useful?

- Mentor Essential Mathematics pg. 146
- Calculators
- Containers
- Exercise books
- Mentor Essential Mathematics pg. 147
- Digital resources
- Reference books

- Observation - Oral questions - Written assignments

Measurements and Geometry

Commercial Arithmetic I - Preparing a budget
Commercial Arithmetic I - Balancing a budget
Commercial Arithmetic I - Calculating discounts

By the end of the lesson, the learner should be able to:

- Prepare a budget for clubs or societies
- Identify sources of income and expenditure
- Apply budgeting skills to planning school events and fundraising activities

- Study sample budget presentation for drama club
- Discuss sources of income and fund allocation
- Brainstorm creative ways to raise funds for clubs
- Discuss what happens if expenses exceed income

Why do we need a budget?

- Mentor Essential Mathematics pg. 148
- Sample budgets
- Exercise books
- Calculators
- Mentor Essential Mathematics pg. 149
- Calculators
- Chart paper
- Mentor Essential Mathematics pg. 150
- Price lists
- Shopping receipts

- Observation - Oral questions - Written assignments

Measurements and Geometry

Commercial Arithmetic I - Percentage discount
Commercial Arithmetic I - Calculating commission
Commercial Arithmetic I - Percentage commission and tiered rates

By the end of the lesson, the learner should be able to:

- Calculate percentage discount
- Determine selling price after discount
- Compare discounts offered by different shops to make wise purchasing decisions

- Calculate percentage discount using formula: (Discount/Marked price) × 100%
- Work out selling price when percentage discount is given
- Compare prices at different shops offering different discounts
- Determine which shop offers better value

How do we calculate percentage discount?

- Mentor Essential Mathematics pg. 151
- Calculators
- Price catalogues
- Exercise books
- Mentor Essential Mathematics pg. 153
- Exercise books
- Reference books
- Mentor Essential Mathematics pg. 154
- Digital resources

- Observation - Oral questions - Written tests

Measurements and Geometry

Commercial Arithmetic I - Profit and percentage profit
Commercial Arithmetic I - Loss and percentage loss
Commercial Arithmetic I - Currency exchange rates

By the end of the lesson, the learner should be able to:

- Determine profit made in sale of goods
- Calculate percentage profit
- Apply profit calculations to small businesses like mandazi selling and craft making

- Discuss meaning of cost price and selling price
- Calculate profit: Selling price - Cost price
- Work out percentage profit: (Profit/Cost price) × 100%
- Solve problems on businesses making profits

How do we determine profit in business?

- Mentor Essential Mathematics pg. 155
- Calculators
- Exercise books
- Reference books
- Mentor Essential Mathematics pg. 157
- Case studies
- Mentor Essential Mathematics pg. 160
- Currency exchange tables
- Digital resources

- Observation - Oral questions - Written assignments

Measurements and Geometry
Statistics and Probability
Statistics and Probability

Commercial Arithmetic I - Currency conversion problems
Statistics - Frequency distribution tables for ungrouped data
Statistics - Constructing frequency distribution tables

By the end of the lesson, the learner should be able to:

- Convert foreign currencies to Kenyan shillings
- Solve problems involving buying and selling rates
- Apply currency conversion to international trade, remittances and travel budgeting

- Convert US dollars, Euros and Yen to Kenya shillings
- Use buying rate when bank buys foreign currency
- Use selling rate when bank sells foreign currency
- Calculate amount received after currency exchange round trips

How do we convert currencies using exchange rates?

- Mentor Essential Mathematics pg. 162
- Currency exchange tables
- Calculators
- Exercise books
- Mentor Essential Mathematics pg. 166
- Tally charts
- Data collection sheets
- Mentor Essential Mathematics pg. 167
- Data sets
- Tally charts

- Observation - Oral questions - Written tests

Statistics and Probability

Statistics - Mean of ungrouped data
Statistics - Mean from frequency distribution tables
Statistics - Mode of ungrouped data

By the end of the lesson, the learner should be able to:

- Define the mean of a data set
- Calculate the mean of ungrouped data
- Connect mean to finding average scores, prices and measurements in daily life

- Collect data on number of children in families
- Calculate the sum of all values and divide by count
- Discuss average marks, heights and incomes

How do we use statistics in day-to-day life?

- Mentor Essential Mathematics pg. 167
- Calculators
- Data collection sheets
- Mentor Essential Mathematics pg. 168
- Frequency table templates
- Mentor Essential Mathematics pg. 169
- Data sets
- Frequency tables

- Oral questions - Written exercises - Class activities

Statistics and Probability

Statistics - Median of ungrouped data
Statistics - Comparing mean, mode and median
Statistics - Bar graphs
Statistics - Line graphs

By the end of the lesson, the learner should be able to:

- Define the median of a data set
- Determine the median by arranging data in order
- Apply median to find middle values in income distributions and test scores

- Arrange data in ascending or descending order
- Identify the middle value for odd number of items
- Calculate median for even number of items

How do we use statistics in day-to-day life?

- Mentor Essential Mathematics pg. 169
- Data sets
- Calculators
- Mentor Essential Mathematics pg. 170
- Calculators
- Data sets
- Mentor Essential Mathematics pg. 172
- Graph paper
- Rulers
- Pencils
- Mentor Essential Mathematics pg. 174

- Written exercises - Class activities - Oral questions

Statistics and Probability

Statistics - Pie charts

By the end of the lesson, the learner should be able to:

- Define a pie chart and calculate sector angles
- Draw pie charts from frequency tables
- Use pie charts to display budget allocations, time spent on activities and crop distributions

- Calculate angles for each category (value/total × 360°)
- Use protractor to draw sectors accurately
- Represent salary budgets, fruit sales and land use data

How do we use statistics in day-to-day life?

- Mentor Essential Mathematics pg. 176
- Protractors
- Compasses
- Calculators

- Practical exercises - Observation - Class activities

Statistics and Probability

Statistics - Interpreting bar graphs
Statistics - Interpreting line graphs and pie charts

By the end of the lesson, the learner should be able to:

- Read and interpret information from bar graphs
- Answer questions based on bar graph data
- Extract information from graphs showing rainfall, sports attendance and hospital discharges

- Identify scales used on axes
- Read values from bars accurately
- Calculate totals, differences and comparisons from bar graphs

How do we use statistics in day-to-day life?

- Mentor Essential Mathematics pg. 181
- Sample bar graphs
- Calculators
- Mentor Essential Mathematics pg. 185
- Sample graphs and charts
- Calculators
- Protractors

- Oral questions - Written exercises - Class activities

Statistics and Probability

Probability - Equally likely outcomes
Probability - Calculating probability of equally likely outcomes

By the end of the lesson, the learner should be able to:

- Define probability and equally likely outcomes
- Perform experiments with coins and dice
- Relate probability to games of chance and weather prediction

- Toss coins and record outcomes
- Roll dice and list possible outcomes
- Discuss probability spaces for simple experiments

How do we apply probability in day-to-day life?

- Mentor Essential Mathematics pg. 198
- Coins
- Dice
- Spinners
- Mentor Essential Mathematics pg. 199
- Coloured balls
- Number cards
- Calculators

- Practical exercises - Observation - Oral questions

Statistics and Probability

Probability - Range of probability of an event

By the end of the lesson, the learner should be able to:

- State the range of probability (0 to 1)
- Identify certain and impossible events
- Relate probability range to everyday certainties like sunrise and impossibilities like flying unaided

- Discuss events that are certain (probability = 1)
- Identify impossible events (probability = 0)
- Calculate probability and verify it falls within 0 to 1

How do we apply probability in day-to-day life?

- Mentor Essential Mathematics pg. 201
- Event cards
- Probability scale charts

- Oral questions - Written exercises - Observation

Statistics and Probability

Probability - Mutually exclusive events
Probability - Performing experiments on mutually exclusive events

By the end of the lesson, the learner should be able to:

- Define mutually exclusive events
- Identify mutually exclusive events in real situations
- Relate mutually exclusive events to choices like selecting one job from two offers at the same time

- Use digital resources to research mutually exclusive events
- Classify given events as mutually exclusive or not
- Discuss examples in elections, travel choices and course selection

How do we apply probability in day-to-day life?

- Mentor Essential Mathematics pg. 202
- Digital devices
- Event scenario cards
- Mentor Essential Mathematics pg. 203
- Spinners
- Dice
- Coloured cards

- Written exercises - Class activities - Oral questions

Statistics and Probability

Probability - Calculating probability of mutually exclusive events
Probability - Independent events
Probability - Calculating probability of independent events

By the end of the lesson, the learner should be able to:

- Calculate probability of mutually exclusive events
- Apply the addition rule: P(A or B) = P(A) + P(B)
- Solve problems on selecting items, choosing colours and picking numbers

- Calculate probability of one event or another occurring
- Solve problems involving picking pens, balls of different colours
- Discuss probability of rolling different numbers on a die

How do we apply probability in day-to-day life?

- Mentor Essential Mathematics pg. 204
- Calculators
- Probability problem cards
- Mentor Essential Mathematics pg. 206
- Coins
- Dice
- Outcome tables
- Mentor Essential Mathematics pg. 207

- Written exercises - Class activities - Written tests