Reduce Ratio 7:21

Here we will reduce the ratio 7:21 as much as possible. In other words, we will make the numbers 7 and 21 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 7 and 21 can be divided by. Then we divide both 7 and 21 by that number to get the new reduced ratio.

The largest number 7 and 21 can be divided by is 7. When we divide both numbers by 7, we get the new reduced ratio as follows:

1:3

To summarize, the ratio 7:21 reduced as much as possible is 1:3. You could also say that the ratio 7:21 equals 1:3.

Ratio Reducer
Use our Ratio Reducer to reduce another ratio:

Reduce Ratio 7:22
Here is the next ratio on our list that we reduced.