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Title: Ratio and proportions
Description: A lesson on Ration and proportions. It also contains worked example questions.
Description: A lesson on Ration and proportions. It also contains worked example questions.
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RATIOS AND
PROPORTIONS
LEARNING OBJECTIVES
●
●
LESSON OBJECTIVE: To be able to analyse
the concepts of ratios and proportions
Success Criteria: CAN apply the concepts of
ratios and proportions in solving problems
in real life
Ratios
01
A ratio is a comparative measure of 2 or more
quantities of the same kind in the same unit of
measurement
...
For example: if there are 10 apples for every 5
mangoes, the ratio of apples to mangoes is 10:5
...
The order of the terms in ratio is very important
...
How many tulips are
there?
Step 1 - Number of sunflowers = 135
Step 2 - Number of sunflowers for 1 tulip = 15/12
Step 3 - Number of tulips = 135/15 x 12
= 108 tulips
02
Direct
proportion
●
Direct proportion or direct variation is
the relation between two quantities
where the ratio of the two is equal to a
constant value
...
●
Jeremy uses 400g of flour to make 8 muffins
...
When
one quantity decreases the other
quantity increases too
...
It is also called an
indirect variation
...
●
A plane travelling at 250 km/h takes 2 hours for a
complete journey
...
3 hours or 3 hours and 18 minutes
...
Indirect Proportion is when one quantity increases the other
quantity decreases
...
Title: Ratio and proportions
Description: A lesson on Ration and proportions. It also contains worked example questions.
Description: A lesson on Ration and proportions. It also contains worked example questions.