Subtract 80/50 from 4/21, Solve 4/21

Subtract 80/50 from 4/21

1^st number: 4/21, 2^nd number: 1 30/50

4/21 - 80/50 is -148/105.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 50 is 1050

Next, find the equivalent fraction of both fractional numbers with denominator 1050
For the 1st fraction, since 21 × 50 = 1050,
4/21 = 4 × 50/21 × 50 = 200/1050
Likewise, for the 2nd fraction, since 50 × 21 = 1050,
80/50 = 80 × 21/50 × 21 = 1680/1050
Subtract the two like fractions:
200/1050 - 1680/1050 = 200 - 1680/1050 = -1480/1050
After reducing the fraction, the answer is -148/105

MathStep (Works offline)

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