Answers

Add 28/21 and 56/15

1^st number: 1 7/21, 2^nd number: 3 11/15

28/21 + 56/15 is 76/15.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 15 is 105
   
   Next, find the equivalent fraction of both fractional numbers with denominator 105
2. For the 1st fraction, since 21 × 5 = 105,
   28/21 = 28 × 5/21 × 5 = 140/105
3. Likewise, for the 2nd fraction, since 15 × 7 = 105,
   56/15 = 56 × 7/15 × 7 = 392/105
4. Add the two like fractions:
   140/105 + 392/105 = 140 + 392/105 = 532/105
5. 532/105 simplified gives 76/15
6. So, 28/21 + 56/15 = 76/15
   In mixed form: 51/15

MathStep (Works offline)

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

Related: ⁵⁶/₂₁+⁵⁶/₁₅ ²⁸/₄₂+⁵⁶/₁₅ ²⁸/₂₁+⁵⁶/₃₀ ⁸⁴/₂₁+⁵⁶/₁₅ ²⁸/₆₃+⁵⁶/₁₅ ²⁸/₂₁+⁵⁶/₄₅ ²⁸/₂₁+⁵⁶/₇₅

Add Fractions Calculator