Answers

Add 72/20 and 49/28

1^st number: 3 12/20, 2^nd number: 1 21/28

72/20 + 49/28 is 107/20.

Steps for adding 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,
   49/28 = 49 × 5/28 × 5 = 245/140
4. Add the two like fractions:
   504/140 + 245/140 = 504 + 245/140 = 749/140
5. 749/140 simplified gives 107/20
6. So, 72/20 + 49/28 = 107/20
   In mixed form: 57/20

MathStep (Works offline)

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

Related: ⁷²/₂₀+⁹⁸/₂₈ ⁷²/₄₀+⁴⁹/₂₈ ⁷²/₂₀+⁴⁹/₅₆ ⁷²/₆₀+⁴⁹/₂₈ ⁷²/₂₀+⁴⁹/₈₄

Add Fractions Calculator