Answers

Add 20/21 and 40/18

1^st number: 20/21, 2^nd number: 2 4/18

20/21 + 40/18 is 200/63.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 18 is 126
2. For the 1st fraction, since 21 × 6 = 126,
   20/21 = 20 × 6/21 × 6 = 120/126
3. Likewise, for the 2nd fraction, since 18 × 7 = 126,
   40/18 = 40 × 7/18 × 7 = 280/126
4. Add the two fractions:
   120/126 + 280/126 = 120 + 280/126 = 400/126
5. After reducing the fraction, the answer is 200/63
6. In mixed form: 311/63

MathStep (Works offline)

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

Related: ⁴⁰/₂₁+⁴⁰/₁₈ ²⁰/₂₁+⁸⁰/₁₈ ²⁰/₄₂+⁴⁰/₁₈ ²⁰/₂₁+⁴⁰/₃₆ ⁶⁰/₂₁+⁴⁰/₁₈ ²⁰/₆₃+⁴⁰/₁₈ ²⁰/₂₁+⁴⁰/₅₄ ²⁰/₂₁+⁴⁰/₉₀

Add Fractions Calculator