Reduce Ratio 21:9

Here we will reduce the ratio 21:9 as much as possible. In other words, we will make the numbers 21 and 9 as low as they can be while still keeping the same ratio between the two numbers.

To do this we find the largest number that both 21 and 9 can be divided by. Then we divide both 21 and 9 by that number to get the new reduced ratio.

The largest number 21 and 9 can be divided by is 3. When we divide both numbers by 3, we get the new reduced ratio as follows:

7:3

To summarize, the ratio 21:9 reduced as much as possible is 7:3. You could also say that the ratio 21:9 equals 7:3.

Ratio Reducer
Use our Ratio Reducer to reduce another ratio:

Reduce Ratio 21:10
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