Add 12/28 and 21/15
1st number: 12/28, 2nd number: 1 6/15
12/28 + 21/15 is 64/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 15 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 28 × 15 = 420,
12/28 = 12 × 15/28 × 15 = 180/420 - Likewise, for the 2nd fraction, since 15 × 28 = 420,
21/15 = 21 × 28/15 × 28 = 588/420 - Add the two like fractions:
180/420 + 588/420 = 180 + 588/420 = 768/420 - 768/420 simplified gives 64/35
- So, 12/28 + 21/15 = 64/35
In mixed form: 129/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/28+21/15 12/28+42/15 12/56+21/15 12/28+21/30 36/28+21/15 12/28+63/15 12/84+21/15 12/28+21/45 60/28+21/15 12/28+21/75 84/28+21/15