Add 20/56 and 21/72
20/56 + 21/72 is 109/168.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 56 and 72 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 56 × 9 = 504,
20/56 = 20 × 9/56 × 9 = 180/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
21/72 = 21 × 7/72 × 7 = 147/504 - Add the two like fractions:
180/504 + 147/504 = 180 + 147/504 = 327/504 - 327/504 simplified gives 109/168
- So, 20/56 + 21/72 = 109/168
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/56+21/72 20/56+42/72 60/56+21/72 20/56+63/72