Add 15/21 and 28/56
15/21 + 28/56 is 17/14.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 56 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 21 × 8 = 168,
15/21 = 15 × 8/21 × 8 = 120/168 - Likewise, for the 2nd fraction, since 56 × 3 = 168,
28/56 = 28 × 3/56 × 3 = 84/168 - Add the two like fractions:
120/168 + 84/168 = 120 + 84/168 = 204/168 - 204/168 simplified gives 17/14
- So, 15/21 + 28/56 = 17/14
In mixed form: 13/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/21+28/56 15/42+28/56 45/21+28/56 15/21+84/56 15/63+28/56 75/21+28/56