Answers

Add 36/21 and 90/72

1^st number: 1 15/21, 2^nd number: 1 18/72

36/21 + 90/72 is 83/28.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 72 is 504
   
   Next, find the equivalent fraction of both fractional numbers with denominator 504
2. For the 1st fraction, since 21 × 24 = 504,
   36/21 = 36 × 24/21 × 24 = 864/504
3. Likewise, for the 2nd fraction, since 72 × 7 = 504,
   90/72 = 90 × 7/72 × 7 = 630/504
4. Add the two like fractions:
   864/504 + 630/504 = 864 + 630/504 = 1494/504
5. 1494/504 simplified gives 83/28
6. So, 36/21 + 90/72 = 83/28
   In mixed form: 227/28

MathStep (Works offline)

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

Related: ⁷²/₂₁+⁹⁰/₇₂ ³⁶/₄₂+⁹⁰/₇₂ ³⁶/₆₃+⁹⁰/₇₂

Add Fractions Calculator