Subtract 10/72 from 15/7, Solve 2 1/7

Subtract 10/72 from 15/7

1^st number: 2 1/7, 2^nd number: 10/72

15/7 - 10/72 is 505/252.

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

Next, find the equivalent fraction of both fractional numbers with denominator 504
For the 1st fraction, since 7 × 72 = 504,
15/7 = 15 × 72/7 × 72 = 1080/504
Likewise, for the 2nd fraction, since 72 × 7 = 504,
10/72 = 10 × 7/72 × 7 = 70/504
Subtract the two like fractions:
1080/504 - 70/504 = 1080 - 70/504 = 1010/504
After reducing the fraction, the answer is 505/252
In mixed form: 21/252

MathStep (Works offline)

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