Answers

Add 72/21 and 15/36

1^st number: 3 9/21, 2^nd number: 15/36

72/21 + 15/36 is 323/84.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 36 is 252
   
   Next, find the equivalent fraction of both fractional numbers with denominator 252
2. For the 1st fraction, since 21 × 12 = 252,
   72/21 = 72 × 12/21 × 12 = 864/252
3. Likewise, for the 2nd fraction, since 36 × 7 = 252,
   15/36 = 15 × 7/36 × 7 = 105/252
4. Add the two like fractions:
   864/252 + 105/252 = 864 + 105/252 = 969/252
5. 969/252 simplified gives 323/84
6. So, 72/21 + 15/36 = 323/84
   In mixed form: 371/84

MathStep (Works offline)

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

Related: ⁷²/₂₁+³⁰/₃₆ ⁷²/₄₂+¹⁵/₃₆ ⁷²/₂₁+¹⁵/₇₂ ⁷²/₂₁+⁴⁵/₃₆ ⁷²/₆₃+¹⁵/₃₆ ⁷²/₂₁+⁷⁵/₃₆

Add Fractions Calculator