Ratios
11+ Maths, topic 6.1.1
Ratios
A ratio shows how much there is of one thing compared with another thing.
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How to write ratios
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How to find the number of parts
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Example farm ratio problem
- The ratio of cows to sheep on a farm is 2:3. I have 500 animals in total.
- How many cows are there and how many sheep?
1) Work out the number of parts
2) Divide number of animals by parts
- Divide the total number of animals by the total number of parts to find out how many animals there are in each equal part.
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3) Multiply ratios by 100
- Multiply 100 (the number of animals in each part) by each side of the ratio to find the numbers of cows and sheep.
Write the answers
- There are 200 cows and 300 sheep.
Test yourself on Ratios
Apple squash needs to be mixed with water in the ratio 1:2. If I make a 600 ml drink, how many ml of apple squash did I use?
Harriet and Jess share 60 stickers between them in the ratio 7:5. How many stickers does Jess receive?