You can use a calculator, or do it by yourself.
All you have to do is divide the numerator, or top number, by the denominator, the bottom number.
Example:
6/32
Numerator = 6
Denominator = 32
Divide 6 by 32:
The answer is 0.1875.
6/32 as a decimal is 0.1875.
Hope this helped☺☺