Add 80/42 and 28/72
1st number: 1 38/42, 2nd number: 28/72
80/42 + 28/72 is 289/126.
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,
80/42 = 80 × 12/42 × 12 = 960/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
28/72 = 28 × 7/72 × 7 = 196/504 - Add the two like fractions:
960/504 + 196/504 = 960 + 196/504 = 1156/504 - 1156/504 simplified gives 289/126
- So, 80/42 + 28/72 = 289/126
In mixed form: 237/126
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/42+56/72 80/84+28/72 80/42+84/72