Add 21/56 and 20/36
21/56 + 20/36 is 67/72.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 56 and 36 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 56 × 9 = 504,
21/56 = 21 × 9/56 × 9 = 189/504 - Likewise, for the 2nd fraction, since 36 × 14 = 504,
20/36 = 20 × 14/36 × 14 = 280/504 - Add the two like fractions:
189/504 + 280/504 = 189 + 280/504 = 469/504 - 469/504 simplified gives 67/72
- So, 21/56 + 20/36 = 67/72
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/56+20/36 21/56+40/36 21/56+20/72 63/56+20/36 21/56+60/36