Subtract 70/27 from 18/28, Solve 18/28

Subtract 70/27 from 18/28

1^st number: 18/28, 2^nd number: 2 16/27

18/28 - 70/27 is -737/378.

Find the least common denominator or LCM of the two denominators:
LCM of 28 and 27 is 756

Next, find the equivalent fraction of both fractional numbers with denominator 756
For the 1st fraction, since 28 × 27 = 756,
18/28 = 18 × 27/28 × 27 = 486/756
Likewise, for the 2nd fraction, since 27 × 28 = 756,
70/27 = 70 × 28/27 × 28 = 1960/756
Subtract the two like fractions:
486/756 - 1960/756 = 486 - 1960/756 = -1474/756
After reducing the fraction, the answer is -737/378

MathStep (Works offline)

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