Add 80/72 and 27/28, Solve 1 8/72 + 27/28 as a fraction

Add 80/72 and 27/28

1^st number: 1 8/72, 2^nd number: 27/28

80/72 + 27/28 is 523/252.

Find the least common denominator or LCM of the two denominators:
LCM of 72 and 28 is 504

Next, find the equivalent fraction of both fractional numbers with denominator 504
For the 1st fraction, since 72 × 7 = 504,
80/72 = 80 × 7/72 × 7 = 560/504
Likewise, for the 2nd fraction, since 28 × 18 = 504,
27/28 = 27 × 18/28 × 18 = 486/504
Add the two like fractions:
560/504 + 486/504 = 560 + 486/504 = 1046/504
1046/504 simplified gives 523/252
So, 80/72 + 27/28 = 523/252
In mixed form: 219/252

MathStep (Works offline)

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