Answers

Add 27/21 and 63/20

1^st number: 1 6/21, 2^nd number: 3 3/20

27/21 + 63/20 is 621/140.

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,
   27/21 = 27 × 20/21 × 20 = 540/420
3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
   63/20 = 63 × 21/20 × 21 = 1323/420
4. Add the two like fractions:
   540/420 + 1323/420 = 540 + 1323/420 = 1863/420
5. 1863/420 simplified gives 621/140
6. So, 27/21 + 63/20 = 621/140
   In mixed form: 461/140

MathStep (Works offline)

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

Related: ⁵⁴/₂₁+⁶³/₂₀ ²⁷/₄₂+⁶³/₂₀ ²⁷/₂₁+⁶³/₄₀ ⁸¹/₂₁+⁶³/₂₀ ²⁷/₆₃+⁶³/₂₀ ²⁷/₂₁+⁶³/₆₀

Add Fractions Calculator