Add 80/42 and 18/72
1st number: 1 38/42, 2nd number: 18/72
80/42 + 18/72 is 181/84.
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,
18/72 = 18 × 7/72 × 7 = 126/504 - Add the two like fractions:
960/504 + 126/504 = 960 + 126/504 = 1086/504 - 1086/504 simplified gives 181/84
- So, 80/42 + 18/72 = 181/84
In mixed form: 213/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/42+36/72 80/84+18/72 80/42+54/72 80/42+90/72