Subtract 80/21 from 70/48, Solve 1 22/48

Subtract 80/21 from 70/48

1^st number: 1 22/48, 2^nd number: 3 17/21

70/48 - 80/21 is -395/168.

Find the least common denominator or LCM of the two denominators:
LCM of 48 and 21 is 336

Next, find the equivalent fraction of both fractional numbers with denominator 336
For the 1st fraction, since 48 × 7 = 336,
70/48 = 70 × 7/48 × 7 = 490/336
Likewise, for the 2nd fraction, since 21 × 16 = 336,
80/21 = 80 × 16/21 × 16 = 1280/336
Subtract the two like fractions:
490/336 - 1280/336 = 490 - 1280/336 = -790/336
After reducing the fraction, the answer is -395/168

MathStep (Works offline)

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