Add 90/21 and 10/72, Solve 4 6/21 + 10/72 as a fraction

Add 90/21 and 10/72

1^st number: 4 6/21, 2^nd number: 10/72

90/21 + 10/72 is 1115/252.

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

Next, find the equivalent fraction of both fractional numbers with denominator 504
For the 1st fraction, since 21 × 24 = 504,
90/21 = 90 × 24/21 × 24 = 2160/504
Likewise, for the 2nd fraction, since 72 × 7 = 504,
10/72 = 10 × 7/72 × 7 = 70/504
Add the two like fractions:
2160/504 + 70/504 = 2160 + 70/504 = 2230/504
2230/504 simplified gives 1115/252
So, 90/21 + 10/72 = 1115/252
In mixed form: 4107/252

MathStep (Works offline)

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