Subtract 70/49 from 7/15, Solve 7/15

Subtract 70/49 from 7/15

1^st number: 7/15, 2^nd number: 1 21/49

7/15 - 70/49 is -101/105.

Find the least common denominator or LCM of the two denominators:
LCM of 15 and 49 is 735

Next, find the equivalent fraction of both fractional numbers with denominator 735
For the 1st fraction, since 15 × 49 = 735,
7/15 = 7 × 49/15 × 49 = 343/735
Likewise, for the 2nd fraction, since 49 × 15 = 735,
70/49 = 70 × 15/49 × 15 = 1050/735
Subtract the two like fractions:
343/735 - 1050/735 = 343 - 1050/735 = -707/735
After reducing the fraction, the answer is -101/105

MathStep (Works offline)

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