Add 28/15 and 21/5
1st number: 1 13/15, 2nd number: 4 1/5
28/15 + 21/5 is 91/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 5 is 15
Next, find the equivalent fraction of both fractional numbers with denominator 15 - For the 1st fraction, since 15 × 1 = 15,
28/15 = 28 × 1/15 × 1 = 28/15 - Likewise, for the 2nd fraction, since 5 × 3 = 15,
21/5 = 21 × 3/5 × 3 = 63/15 - Add the two like fractions:
28/15 + 63/15 = 28 + 63/15 = 91/15 - So, 28/15 + 21/5 = 91/15
In mixed form: 61/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/15+21/5 28/15+42/5 28/30+21/5 28/15+21/10 84/15+21/5 28/15+63/5 28/45+21/5 28/15+21/15 28/75+21/5 28/15+21/25 28/15+21/35