write the ratio of 20 to 18 in lowest terms

10 to 9

or 1.11 to 1

To write the ratio of 20 to 18 in the lowest terms, we need to find the greatest common divisor (GCD) of the two numbers and divide both numbers by it.

Step 1: Find the GCD (greatest common divisor) of 20 and 18.
To find the GCD, we can use the Euclidean algorithm.

Divide 20 by 18:
20 ÷ 18 = 1 remainder 2

Now divide 18 by the remainder (2):
18 ÷ 2 = 9 remainder 0

Since the remainder is 0, we stop. The GCD of 20 and 18 is 2.

Step 2: Divide both numbers by the GCD.
Divide both 20 and 18 by the GCD, which is 2.
20 ÷ 2 = 10
18 ÷ 2 = 9

The ratio of 20 to 18 in lowest terms is 10:9.