Subtract 30/96 from 4/21, Solve 4/21

Subtract 30/96 from 4/21

4/21 - 30/96 is -41/336.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 96 is 672

Next, find the equivalent fraction of both fractional numbers with denominator 672
For the 1st fraction, since 21 × 32 = 672,
4/21 = 4 × 32/21 × 32 = 128/672
Likewise, for the 2nd fraction, since 96 × 7 = 672,
30/96 = 30 × 7/96 × 7 = 210/672
Subtract the two like fractions:
128/672 - 210/672 = 128 - 210/672 = -82/672
After reducing the fraction, the answer is -41/336

MathStep (Works offline)

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