Add 81/72 and 8/7, Solve 1 9/72 + 1 1/7 as a fraction

Add 81/72 and 8/7

1^st number: 1 9/72, 2^nd number: 1 1/7

81/72 + 8/7 is 127/56.

Find the least common denominator or LCM of the two denominators:
LCM of 72 and 7 is 504

Next, find the equivalent fraction of both fractional numbers with denominator 504
For the 1st fraction, since 72 × 7 = 504,
81/72 = 81 × 7/72 × 7 = 567/504
Likewise, for the 2nd fraction, since 7 × 72 = 504,
8/7 = 8 × 72/7 × 72 = 576/504
Add the two like fractions:
567/504 + 576/504 = 567 + 576/504 = 1143/504
1143/504 simplified gives 127/56
So, 81/72 + 8/7 = 127/56
In mixed form: 215/56

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad