Add 15/21 and 56/45
1st number: 15/21, 2nd number: 1 11/45
15/21 + 56/45 is 617/315.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 45 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 21 × 15 = 315,
15/21 = 15 × 15/21 × 15 = 225/315 - Likewise, for the 2nd fraction, since 45 × 7 = 315,
56/45 = 56 × 7/45 × 7 = 392/315 - Add the two like fractions:
225/315 + 392/315 = 225 + 392/315 = 617/315 - So, 15/21 + 56/45 = 617/315
In mixed form: 1302/315
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/21+56/45 15/42+56/45 15/21+56/90 45/21+56/45 15/63+56/45 75/21+56/45