Subtract 28/64 from 15/7, Solve 2 1/7

Subtract 28/64 from 15/7

1^st number: 2 1/7, 2^nd number: 28/64

15/7 - 28/64 is 191/112.

Find the least common denominator or LCM of the two denominators:
LCM of 7 and 64 is 448

Next, find the equivalent fraction of both fractional numbers with denominator 448
For the 1st fraction, since 7 × 64 = 448,
15/7 = 15 × 64/7 × 64 = 960/448
Likewise, for the 2nd fraction, since 64 × 7 = 448,
28/64 = 28 × 7/64 × 7 = 196/448
Subtract the two like fractions:
960/448 - 196/448 = 960 - 196/448 = 764/448
After reducing the fraction, the answer is 191/112
In mixed form: 179/112

MathStep (Works offline)

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