Answers

Add 70/21 and 8/40

1^st number: 3 7/21, 2^nd number: 8/40

70/21 + 8/40 is 53/15.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 40 is 840
   
   Next, find the equivalent fraction of both fractional numbers with denominator 840
2. For the 1st fraction, since 21 × 40 = 840,
   70/21 = 70 × 40/21 × 40 = 2800/840
3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
   8/40 = 8 × 21/40 × 21 = 168/840
4. Add the two like fractions:
   2800/840 + 168/840 = 2800 + 168/840 = 2968/840
5. 2968/840 simplified gives 53/15
6. So, 70/21 + 8/40 = 53/15
   In mixed form: 38/15

MathStep (Works offline)

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

Related: ⁷⁰/₂₁+¹⁶/₄₀ ⁷⁰/₄₂+⁸/₄₀ ⁷⁰/₂₁+⁸/₈₀ ⁷⁰/₂₁+²⁴/₄₀ ⁷⁰/₆₃+⁸/₄₀ ⁷⁰/₂₁+⁵⁶/₄₀

Add Fractions Calculator