Answers

Add 72/21 and 90/16

1^st number: 3 9/21, 2^nd number: 5 10/16

72/21 + 90/16 is 507/56.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 16 is 336
   
   Next, find the equivalent fraction of both fractional numbers with denominator 336
2. For the 1st fraction, since 21 × 16 = 336,
   72/21 = 72 × 16/21 × 16 = 1152/336
3. Likewise, for the 2nd fraction, since 16 × 21 = 336,
   90/16 = 90 × 21/16 × 21 = 1890/336
4. Add the two like fractions:
   1152/336 + 1890/336 = 1152 + 1890/336 = 3042/336
5. 3042/336 simplified gives 507/56
6. So, 72/21 + 90/16 = 507/56
   In mixed form: 93/56

MathStep (Works offline)

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

Related: ⁷²/₄₂+⁹⁰/₁₆ ⁷²/₂₁+⁹⁰/₃₂ ⁷²/₆₃+⁹⁰/₁₆ ⁷²/₂₁+⁹⁰/₄₈ ⁷²/₂₁+⁹⁰/₈₀

Add Fractions Calculator