Answers

Add 8/21 and 8/20

8/21 + 8/20 is 82/105.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 20 is 420
   
   Next, find the equivalent fraction of both fractional numbers with denominator 420
2. For the 1st fraction, since 21 × 20 = 420,
   8/21 = 8 × 20/21 × 20 = 160/420
3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
   8/20 = 8 × 21/20 × 21 = 168/420
4. Add the two like fractions:
   160/420 + 168/420 = 160 + 168/420 = 328/420
5. 328/420 simplified gives 82/105
6. So, 8/21 + 8/20 = 82/105

MathStep (Works offline)

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

Related: ¹⁶/₂₁+⁸/₂₀ ⁸/₂₁+¹⁶/₂₀ ⁸/₄₂+⁸/₂₀ ⁸/₂₁+⁸/₄₀ ²⁴/₂₁+⁸/₂₀ ⁸/₂₁+²⁴/₂₀ ⁸/₆₃+⁸/₂₀ ⁸/₂₁+⁸/₆₀ ⁴⁰/₂₁+⁸/₂₀ ⁸/₂₁+⁴⁰/₂₀ ⁵⁶/₂₁+⁸/₂₀ ⁸/₂₁+⁵⁶/₂₀

Add Fractions Calculator