Write 9 / 20 as a decimal

The answer is 0.45

If you have a calculator, you can find this by simply inputting it. Otherwise, you should always multiply both the numerator and denominator by a constant that will make the denominator 100. The numerator will then be your decimal digits. In this case, 20 (5) = 100, so 9 (5) = 45. This gives you 0.45 for when you can't use a calculator.