Ratio and Proportion I


   
 
Introduction
 
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:
 
How many more frogs than crabs are there? or How many fewer crabs than frogs are there?
 
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.
 
Here we have used subtraction for comparing.
 
There is another way of comparing. We can also say that the number of crabs are one third the number of frogs.
 
 
Such a comparison by division is called ratio.
 
Number of crabs: No of frogs =1:3
 
 
We can also say that the number of frogs is thrice the number of crabs.
 
 
     
   
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