Subtract 80/49 from 21/48, Solve 21/48

Subtract 80/49 from 21/48

1^st number: 21/48, 2^nd number: 1 31/49

21/48 - 80/49 is -937/784.

Find the least common denominator or LCM of the two denominators:
LCM of 48 and 49 is 2352

Next, find the equivalent fraction of both fractional numbers with denominator 2352
For the 1st fraction, since 48 × 49 = 2352,
21/48 = 21 × 49/48 × 49 = 1029/2352
Likewise, for the 2nd fraction, since 49 × 48 = 2352,
80/49 = 80 × 48/49 × 48 = 3840/2352
Subtract the two like fractions:
1029/2352 - 3840/2352 = 1029 - 3840/2352 = -2811/2352
After reducing the fraction, the answer is -937/784

MathStep (Works offline)

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