Add 7/72 and 54/21, Solve 7/72 + 2 12/21 as a fraction

Add 7/72 and 54/21

1^st number: 7/72, 2^nd number: 2 12/21

7/72 + 54/21 is 1345/504.

Find the least common denominator or LCM of the two denominators:
LCM of 72 and 21 is 504

Next, find the equivalent fraction of both fractional numbers with denominator 504
For the 1st fraction, since 72 × 7 = 504,
7/72 = 7 × 7/72 × 7 = 49/504
Likewise, for the 2nd fraction, since 21 × 24 = 504,
54/21 = 54 × 24/21 × 24 = 1296/504
Add the two like fractions:
49/504 + 1296/504 = 49 + 1296/504 = 1345/504
So, 7/72 + 54/21 = 1345/504
In mixed form: 2337/504

MathStep (Works offline)

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