Add 56/42 and 21/72
1st number: 1 14/42, 2nd number: 21/72
56/42 + 21/72 is 13/8.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 72 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 42 × 12 = 504,
56/42 = 56 × 12/42 × 12 = 672/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
21/72 = 21 × 7/72 × 7 = 147/504 - Add the two like fractions:
672/504 + 147/504 = 672 + 147/504 = 819/504 - 819/504 simplified gives 13/8
- So, 56/42 + 21/72 = 13/8
In mixed form: 15/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/42+42/72 56/84+21/72 56/42+63/72