Add 7/72 and 21/63
7/72 + 21/63 is 31/72.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 63 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 72 × 7 = 504,
7/72 = 7 × 7/72 × 7 = 49/504 - Likewise, for the 2nd fraction, since 63 × 8 = 504,
21/63 = 21 × 8/63 × 8 = 168/504 - Add the two like fractions:
49/504 + 168/504 = 49 + 168/504 = 217/504 - 217/504 simplified gives 31/72
- So, 7/72 + 21/63 = 31/72
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/72+21/63 7/72+42/63 21/72+21/63 35/72+21/63 49/72+21/63