Answers

Add 54/21 and 63/20

1^st number: 2 12/21, 2^nd number: 3 3/20

54/21 + 63/20 is 801/140.

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,
   54/21 = 54 × 20/21 × 20 = 1080/420
3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
   63/20 = 63 × 21/20 × 21 = 1323/420
4. Add the two like fractions:
   1080/420 + 1323/420 = 1080 + 1323/420 = 2403/420
5. 2403/420 simplified gives 801/140
6. So, 54/21 + 63/20 = 801/140
   In mixed form: 5101/140

MathStep (Works offline)

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

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

Add Fractions Calculator