Add 10/21 and 21/72
10/21 + 21/72 is 43/56.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 72 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 21 × 24 = 504,
10/21 = 10 × 24/21 × 24 = 240/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
21/72 = 21 × 7/72 × 7 = 147/504 - Add the two like fractions:
240/504 + 147/504 = 240 + 147/504 = 387/504 - 387/504 simplified gives 43/56
- So, 10/21 + 21/72 = 43/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/21+21/72 10/21+42/72 10/42+21/72 30/21+21/72 10/21+63/72 10/63+21/72 50/21+21/72 70/21+21/72