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SECOND-TERM E NOTES
WEEK ONE
DATE
CLASS
TOPIC: RATIO AND PERCENTAGE
PERIOD
DURATION: 40MINS
BEHAVIOURAL OBJECTIVES: Pupils should be able to:
Reference Materials
Lagos state scheme of work,
Online information
Relevant materials
Pupils textbook
Entry Behavior: pupils are familiar with the topic in their previous classes.
CONTENT
RATIO AND PERCENTAGE
Meaning of ratio
The relation between two quantities (both of the same units) obtained by dividing one quantity with another is called ratio. Ratio can be denoted by using the symbol ( : ).
EXAMPLE 1
What is the ratio between the weight two bags of sugar of 4kg and 6kg respectively?
Solution
Ratio of weights of bags of sugar = 4kg/ 6kg = 2/3 = 2:3
EXAMPLE 2
A pole of length 165cm is divided into two parts such that lengths are in the ration 7:8. Find the length of each part of the pole?
Total ratio = 7 + 8 = 15
First part = 7/15 , second part = 8/15
Length of first part = 7/15 of 165cm
= 7/15 × 165
= 7 x 11 = 77cm
1 x 1
Length of second part = 165cm – 77cm = 88cm
DIRECT PROPORTION
Examples
Solution
5 markers = $18 x 5 = $90
1 textbook = m
2 × m = 1 x $24
2m = $24
M = $24 ÷ 2 = $12. Therefore 1 textbook = $24
(b) Since 1 textbook = $12
5 textbooks = $12 × 5 = $60
Equal and equivalent ratios
1/2 = 4/ 8
3/5 = 6/10
4/3≠6/10 3/5≠7/15
EVALUATION
Strategies& Activities:
Step1: The teacher revises the previous topic.
Step2: The teacher introduces the new topic.
Step3: The teacher explains the new topic.
Step4: Teacher welcomes pupils’ questions.
Step5: The teacher evaluates the pupils
Assessment & Evaluation:
(WRAP-UP CONCLUSION)
The teacher goes over the topic once again to enhance better understanding
Exercise 3
Write these ratios in their lowest terms:
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