Answers

Add 20/21 and 72/24

1^st number: 20/21, 2^nd number: 3 0/24

20/21 + 72/24 is 83/21.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 24 is 168
   
   Next, find the equivalent fraction of both fractional numbers with denominator 168
2. For the 1st fraction, since 21 × 8 = 168,
   20/21 = 20 × 8/21 × 8 = 160/168
3. Likewise, for the 2nd fraction, since 24 × 7 = 168,
   72/24 = 72 × 7/24 × 7 = 504/168
4. Add the two like fractions:
   160/168 + 504/168 = 160 + 504/168 = 664/168
5. 664/168 simplified gives 83/21
6. So, 20/21 + 72/24 = 83/21
   In mixed form: 320/21

MathStep (Works offline)

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

Related: ⁴⁰/₂₁+⁷²/₂₄ ²⁰/₄₂+⁷²/₂₄ ²⁰/₂₁+⁷²/₄₈ ⁶⁰/₂₁+⁷²/₂₄ ²⁰/₆₃+⁷²/₂₄

Add Fractions Calculator