Add 15/28 and 21/7
1st number: 15/28, 2nd number: 3 0/7
15/28 + 21/7 is 99/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 7 is 28
Next, find the equivalent fraction of both fractional numbers with denominator 28 - For the 1st fraction, since 28 × 1 = 28,
15/28 = 15 × 1/28 × 1 = 15/28 - Likewise, for the 2nd fraction, since 7 × 4 = 28,
21/7 = 21 × 4/7 × 4 = 84/28 - Add the two like fractions:
15/28 + 84/28 = 15 + 84/28 = 99/28 - So, 15/28 + 21/7 = 99/28
In mixed form: 315/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/28+21/7 15/28+42/7 15/56+21/7 15/28+21/14 45/28+21/7 15/28+63/7 15/84+21/7 75/28+21/7 15/28+21/35 15/28+21/49