Answers

Subtract 63/20 from 54/72

1^st number: 54/72, 2^nd number: 3 3/20

54/72 - 63/20 is -12/5.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 72 and 20 is 360
   
   Next, find the equivalent fraction of both fractional numbers with denominator 360
2. For the 1st fraction, since 72 × 5 = 360,
   54/72 = 54 × 5/72 × 5 = 270/360
3. Likewise, for the 2nd fraction, since 20 × 18 = 360,
   63/20 = 63 × 18/20 × 18 = 1134/360
4. Subtract the two like fractions:
   270/360 - 1134/360 = 270 - 1134/360 = -864/360
5. After reducing the fraction, the answer is -12/5

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad

Related: ⁵⁴/₇₂-⁶³/₄₀ ⁵⁴/₇₂-⁶³/₆₀

Subtract Fractions Calculator