Answers

Subtract 9/28 from 72/20

1^st number: 3 12/20, 2^nd number: 9/28

72/20 - 9/28 is 459/140.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 20 and 28 is 140
   
   Next, find the equivalent fraction of both fractional numbers with denominator 140
2. For the 1st fraction, since 20 × 7 = 140,
   72/20 = 72 × 7/20 × 7 = 504/140
3. Likewise, for the 2nd fraction, since 28 × 5 = 140,
   9/28 = 9 × 5/28 × 5 = 45/140
4. Subtract the two like fractions:
   504/140 - 45/140 = 504 - 45/140 = 459/140
5. In mixed form: 339/140

MathStep (Works offline)

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

Related: ⁷²/₂₀-¹⁸/₂₈ ⁷²/₄₀-⁹/₂₈ ⁷²/₂₀-⁹/₅₆ ⁷²/₂₀-²⁷/₂₈ ⁷²/₆₀-⁹/₂₈ ⁷²/₂₀-⁹/₈₄ ⁷²/₂₀-⁴⁵/₂₈ ⁷²/₂₀-⁶³/₂₈

Subtract Fractions Calculator