Add 7/42 and 81/72
1st number: 7/42, 2nd number: 1 9/72
7/42 + 81/72 is 31/24.
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,
7/42 = 7 × 12/42 × 12 = 84/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
81/72 = 81 × 7/72 × 7 = 567/504 - Add the two like fractions:
84/504 + 567/504 = 84 + 567/504 = 651/504 - 651/504 simplified gives 31/24
- So, 7/42 + 81/72 = 31/24
In mixed form: 17/24
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/42+81/72 7/84+81/72 21/42+81/72 35/42+81/72 49/42+81/72