
First, find the LCD of the two fractions.
Multiples of 12: 12, 24, 36, 48, 60.
Multiples of 20: 20, 40, 60
The LCD is 60.
Second, change the denominators to be the same as the LCD.
 Third,
Third, 5 × 5 = 25 / 12 × 5 = 60 / 3 × 3 = 9 / 20 × 3 = 60
 Fourth,
Fourth, combine the denominators.
 Fifth,
Fifth, subtract 25 - 9 to get 16.
 Sixth,
Sixth, find the GCF of 16 and 60.
The GCF is 4.
Seventh, divide the numerator by the GCF.

 ÷ 
 Eighth,
Eighth, divide the denominator by the GCF.

 ÷ 
 Ninth,
Ninth, rewrite the fraction in simplest form.

Answer as fraction: 

Answer as decimal: 0.2667