Add 21/15 and 56/8
1st number: 1 6/15, 2nd number: 7 0/8
21/15 + 56/8 is 42/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 8 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 15 × 8 = 120,
21/15 = 21 × 8/15 × 8 = 168/120 - Likewise, for the 2nd fraction, since 8 × 15 = 120,
56/8 = 56 × 15/8 × 15 = 840/120 - Add the two like fractions:
168/120 + 840/120 = 168 + 840/120 = 1008/120 - 1008/120 simplified gives 42/5
- So, 21/15 + 56/8 = 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: 42/15+56/8 21/30+56/8 21/15+56/16 63/15+56/8 21/45+56/8 21/15+56/24 21/75+56/8 21/15+56/40