Add 72/84 and 80/7
1st number: 72/84, 2nd number: 11 3/7
72/84 + 80/7 is 86/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 7 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 84 × 1 = 84,
72/84 = 72 × 1/84 × 1 = 72/84 - Likewise, for the 2nd fraction, since 7 × 12 = 84,
80/7 = 80 × 12/7 × 12 = 960/84 - Add the two like fractions:
72/84 + 960/84 = 72 + 960/84 = 1032/84 - 1032/84 simplified gives 86/7
- So, 72/84 + 80/7 = 86/7
In mixed form: 122/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/84+80/14 72/84+80/21 72/84+80/35 72/84+80/49