Subtract 21/64 from 3/30, Solve 3/30

Subtract 21/64 from 3/30

3/30 - 21/64 is -73/320.

Find the least common denominator or LCM of the two denominators:
LCM of 30 and 64 is 960

Next, find the equivalent fraction of both fractional numbers with denominator 960
For the 1st fraction, since 30 × 32 = 960,
3/30 = 3 × 32/30 × 32 = 96/960
Likewise, for the 2nd fraction, since 64 × 15 = 960,
21/64 = 21 × 15/64 × 15 = 315/960
Subtract the two like fractions:
96/960 - 315/960 = 96 - 315/960 = -219/960
After reducing the fraction, the answer is -73/320

MathStep (Works offline)

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