Answers

Add 28/21 and 56/20

1^st number: 1 7/21, 2^nd number: 2 16/20

28/21 + 56/20 is 62/15.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 20 is 420
   
   Next, find the equivalent fraction of both fractional numbers with denominator 420
2. For the 1st fraction, since 21 × 20 = 420,
   28/21 = 28 × 20/21 × 20 = 560/420
3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
   56/20 = 56 × 21/20 × 21 = 1176/420
4. Add the two like fractions:
   560/420 + 1176/420 = 560 + 1176/420 = 1736/420
5. 1736/420 simplified gives 62/15
6. So, 28/21 + 56/20 = 62/15
   In mixed form: 42/15

MathStep (Works offline)

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

Related: ⁵⁶/₂₁+⁵⁶/₂₀ ²⁸/₄₂+⁵⁶/₂₀ ²⁸/₂₁+⁵⁶/₄₀ ⁸⁴/₂₁+⁵⁶/₂₀ ²⁸/₆₃+⁵⁶/₂₀ ²⁸/₂₁+⁵⁶/₆₀

Add Fractions Calculator