Add 56/8 and 21/15
1st number: 7 0/8, 2nd number: 1 6/15
56/8 + 21/15 is 42/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 15 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 8 × 15 = 120,
56/8 = 56 × 15/8 × 15 = 840/120 - Likewise, for the 2nd fraction, since 15 × 8 = 120,
21/15 = 21 × 8/15 × 8 = 168/120 - Add the two like fractions:
840/120 + 168/120 = 840 + 168/120 = 1008/120 - 1008/120 simplified gives 42/5
- So, 56/8 + 21/15 = 42/5
In mixed form: 82/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/8+42/15 56/16+21/15 56/8+21/30 56/8+63/15 56/24+21/15 56/8+21/45 56/40+21/15 56/8+21/75