**Reduce Ratio 45:90**

Here we will reduce the ratio 45:90 as much as possible. In other words, we will make the numbers 45 and 90 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 45 and 90 can be divided by. Then we divide both 45 and 90 by that number to get the new reduced ratio.

The largest number 45 and 90 can be divided by is 45. When we divide both numbers by 45, we get the new reduced ratio as follows:

**1:2**

To summarize, the ratio 45:90 reduced as much as possible is 1:2. You could also say that the ratio 45:90 equals 1:2.