Subtract 21/42 from 2/50, Solve 2/50

Subtract 21/42 from 2/50

2/50 - 21/42 is -23/50.

Find the least common denominator or LCM of the two denominators:
LCM of 50 and 42 is 1050

Next, find the equivalent fraction of both fractional numbers with denominator 1050
For the 1st fraction, since 50 × 21 = 1050,
2/50 = 2 × 21/50 × 21 = 42/1050
Likewise, for the 2nd fraction, since 42 × 25 = 1050,
21/42 = 21 × 25/42 × 25 = 525/1050
Subtract the two like fractions:
42/1050 - 525/1050 = 42 - 525/1050 = -483/1050
After reducing the fraction, the answer is -23/50

MathStep (Works offline)

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