Subtract 60/21 from 42/50, Solve 42/50

Subtract 60/21 from 42/50

1^st number: 42/50, 2^nd number: 2 18/21

42/50 - 60/21 is -353/175.

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

Next, find the equivalent fraction of both fractional numbers with denominator 1050
For the 1st fraction, since 50 × 21 = 1050,
42/50 = 42 × 21/50 × 21 = 882/1050
Likewise, for the 2nd fraction, since 21 × 50 = 1050,
60/21 = 60 × 50/21 × 50 = 3000/1050
Subtract the two like fractions:
882/1050 - 3000/1050 = 882 - 3000/1050 = -2118/1050
After reducing the fraction, the answer is -353/175

MathStep (Works offline)

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