Answers

Add 70/18 and 75/21

1^st number: 3 16/18, 2^nd number: 3 12/21

70/18 + 75/21 is 470/63.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 18 and 21 is 126
   
   Next, find the equivalent fraction of both fractional numbers with denominator 126
2. For the 1st fraction, since 18 × 7 = 126,
   70/18 = 70 × 7/18 × 7 = 490/126
3. Likewise, for the 2nd fraction, since 21 × 6 = 126,
   75/21 = 75 × 6/21 × 6 = 450/126
4. Add the two like fractions:
   490/126 + 450/126 = 490 + 450/126 = 940/126
5. 940/126 simplified gives 470/63
6. So, 70/18 + 75/21 = 470/63
   In mixed form: 729/63

MathStep (Works offline)

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

Related: ⁷⁰/₃₆+⁷⁵/₂₁ ⁷⁰/₁₈+⁷⁵/₄₂ ⁷⁰/₅₄+⁷⁵/₂₁ ⁷⁰/₁₈+⁷⁵/₆₃ ⁷⁰/₉₀+⁷⁵/₂₁

Add Fractions Calculator