Answers

Add 81/21 and 50/80

1^st number: 3 18/21, 2^nd number: 50/80

81/21 + 50/80 is 251/56.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 80 is 1680
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1680
2. For the 1st fraction, since 21 × 80 = 1680,
   81/21 = 81 × 80/21 × 80 = 6480/1680
3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
   50/80 = 50 × 21/80 × 21 = 1050/1680
4. Add the two like fractions:
   6480/1680 + 1050/1680 = 6480 + 1050/1680 = 7530/1680
5. 7530/1680 simplified gives 251/56
6. So, 81/21 + 50/80 = 251/56
   In mixed form: 427/56

MathStep (Works offline)

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

Related: ⁸¹/₄₂+⁵⁰/₈₀ ⁸¹/₆₃+⁵⁰/₈₀

Add Fractions Calculator