Subtract 63/64 from 12/15, Solve 12/15

Subtract 63/64 from 12/15

12/15 - 63/64 is -59/320.

Find the least common denominator or LCM of the two denominators:
LCM of 15 and 64 is 960

Next, find the equivalent fraction of both fractional numbers with denominator 960
For the 1st fraction, since 15 × 64 = 960,
12/15 = 12 × 64/15 × 64 = 768/960
Likewise, for the 2nd fraction, since 64 × 15 = 960,
63/64 = 63 × 15/64 × 15 = 945/960
Subtract the two like fractions:
768/960 - 945/960 = 768 - 945/960 = -177/960
After reducing the fraction, the answer is -59/320

MathStep (Works offline)

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