Subtract 3/50 from 28/21, Solve 1 7/21

Subtract 3/50 from 28/21

1^st number: 1 7/21, 2^nd number: 3/50

28/21 - 3/50 is 191/150.

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,
28/21 = 28 × 50/21 × 50 = 1400/1050
Likewise, for the 2nd fraction, since 50 × 21 = 1050,
3/50 = 3 × 21/50 × 21 = 63/1050
Subtract the two like fractions:
1400/1050 - 63/1050 = 1400 - 63/1050 = 1337/1050
After reducing the fraction, the answer is 191/150
In mixed form: 141/150

MathStep (Works offline)

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