Add 15/28 and 21/60
15/28 + 21/60 is 31/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 60 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 28 × 15 = 420,
15/28 = 15 × 15/28 × 15 = 225/420 - Likewise, for the 2nd fraction, since 60 × 7 = 420,
21/60 = 21 × 7/60 × 7 = 147/420 - Add the two like fractions:
225/420 + 147/420 = 225 + 147/420 = 372/420 - 372/420 simplified gives 31/35
- So, 15/28 + 21/60 = 31/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/28+21/60 15/28+42/60 15/56+21/60 45/28+21/60 15/28+63/60 15/84+21/60 75/28+21/60