Add 21/15 and 56/63
1st number: 1 6/15, 2nd number: 56/63
21/15 + 56/63 is 103/45.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 63 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 15 × 21 = 315,
21/15 = 21 × 21/15 × 21 = 441/315 - Likewise, for the 2nd fraction, since 63 × 5 = 315,
56/63 = 56 × 5/63 × 5 = 280/315 - Add the two like fractions:
441/315 + 280/315 = 441 + 280/315 = 721/315 - 721/315 simplified gives 103/45
- So, 21/15 + 56/63 = 103/45
In mixed form: 213/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/15+56/63 21/30+56/63 63/15+56/63 21/45+56/63 21/75+56/63