Add 15/56 and 21/49
15/56 + 21/49 is 39/56.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 56 and 49 is 392
Next, find the equivalent fraction of both fractional numbers with denominator 392 - For the 1st fraction, since 56 × 7 = 392,
15/56 = 15 × 7/56 × 7 = 105/392 - Likewise, for the 2nd fraction, since 49 × 8 = 392,
21/49 = 21 × 8/49 × 8 = 168/392 - Add the two like fractions:
105/392 + 168/392 = 105 + 168/392 = 273/392 - 273/392 simplified gives 39/56
- So, 15/56 + 21/49 = 39/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/56+21/49 15/56+42/49 15/56+21/98 45/56+21/49 15/56+63/49 75/56+21/49