Subtract 50/32 from 4/21, Solve 4/21

Subtract 50/32 from 4/21

1^st number: 4/21, 2^nd number: 1 18/32

4/21 - 50/32 is -461/336.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 32 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 32 × 21 = 672,
50/32 = 50 × 21/32 × 21 = 1050/672
Subtract the two like fractions:
128/672 - 1050/672 = 128 - 1050/672 = -922/672
After reducing the fraction, the answer is -461/336

MathStep (Works offline)

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