**Reduce Ratio 15:27**

Here we will reduce the ratio 15:27 as much as possible. In other words, we will make the numbers 15 and 27 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 15 and 27 can be divided by. Then we divide both 15 and 27 by that number to get the new reduced ratio.

The largest number 15 and 27 can be divided by is 3. When we divide both numbers by 3, we get the new reduced ratio as follows:

**5:9**

To summarize, the ratio 15:27 reduced as much as possible is 5:9. You could also say that the ratio 15:27 equals 5:9.