Answers

Add 10/21 and 90/72

1^st number: 10/21, 2^nd number: 1 18/72

10/21 + 90/72 is 145/84.

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,
   10/21 = 10 × 24/21 × 24 = 240/504
3. Likewise, for the 2nd fraction, since 72 × 7 = 504,
   90/72 = 90 × 7/72 × 7 = 630/504
4. Add the two like fractions:
   240/504 + 630/504 = 240 + 630/504 = 870/504
5. 870/504 simplified gives 145/84
6. So, 10/21 + 90/72 = 145/84
   In mixed form: 161/84

MathStep (Works offline)

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

Related: ²⁰/₂₁+⁹⁰/₇₂ ¹⁰/₄₂+⁹⁰/₇₂ ³⁰/₂₁+⁹⁰/₇₂ ¹⁰/₆₃+⁹⁰/₇₂ ⁵⁰/₂₁+⁹⁰/₇₂ ⁷⁰/₂₁+⁹⁰/₇₂

Add Fractions Calculator