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Ratios

A ratio is a comparison of two numbers. It can be written with a colon ( 1 : 5 ), or using the word "to" ( 1 to 5 ), or as a fraction: 1 5

Example:

Write the ratio of blue dots to red dots in the figure.

Math diagram

There are 6 blue dots and 4 red dots.

Write the ratio as a fraction.

6 4

Now reduce the fraction .

3 2

So the ratio of blue dots to red dots is 3 : 2 .

(Note that the ratio of red dots to blue dots is the reciprocal : 2 3 or 2 : 3 .)

 

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