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| Introduction |
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| Let’s say there are 6 frogs and 2 crabs
in a pond. We can compare the number of frogs to the number of crabs in two different ways: |
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 How many more frogs than crabs are there? or How many fewer crabs than frogs are there? |
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| The answer to both the questions is same i.e. 6-2=4. There are 4 more frogs than crabs; or there are 4 crabs less than the number of frogs. |
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| Here we have used subtraction for comparing. |
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 There is another way of comparing. We can also say that the number of crabs are one third the number of frogs. |
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| Such a comparison by division is called ratio. |
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 Number of crabs: No of frogs =1:3 |
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| We can also say that the number of frogs is thrice the number of crabs. |
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