Add 21/15 and 56/7
1st number: 1 6/15, 2nd number: 8 0/7
21/15 + 56/7 is 47/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 7 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 15 × 7 = 105,
21/15 = 21 × 7/15 × 7 = 147/105 - Likewise, for the 2nd fraction, since 7 × 15 = 105,
56/7 = 56 × 15/7 × 15 = 840/105 - Add the two like fractions:
147/105 + 840/105 = 147 + 840/105 = 987/105 - 987/105 simplified gives 47/5
- So, 21/15 + 56/7 = 47/5
In mixed form: 92/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/15+56/7 21/30+56/7 21/15+56/14 63/15+56/7 21/45+56/7 21/15+56/21 21/75+56/7 21/15+56/35 21/15+56/49