Subtract 70/54 from 14/21, Solve 14/21

Subtract 70/54 from 14/21

1^st number: 14/21, 2^nd number: 1 16/54

14/21 - 70/54 is -17/27.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 54 is 378

Next, find the equivalent fraction of both fractional numbers with denominator 378
For the 1st fraction, since 21 × 18 = 378,
14/21 = 14 × 18/21 × 18 = 252/378
Likewise, for the 2nd fraction, since 54 × 7 = 378,
70/54 = 70 × 7/54 × 7 = 490/378
Subtract the two like fractions:
252/378 - 490/378 = 252 - 490/378 = -238/378
After reducing the fraction, the answer is -17/27

MathStep (Works offline)

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