Subtract 35/21 from 7/18, Solve 7/18

Subtract 35/21 from 7/18

1^st number: 7/18, 2^nd number: 1 14/21

7/18 - 35/21 is -23/18.

Find the least common denominator or LCM of the two denominators:
LCM of 18 and 21 is 126

Next, find the equivalent fraction of both fractional numbers with denominator 126
For the 1st fraction, since 18 × 7 = 126,
7/18 = 7 × 7/18 × 7 = 49/126
Likewise, for the 2nd fraction, since 21 × 6 = 126,
35/21 = 35 × 6/21 × 6 = 210/126
Subtract the two like fractions:
49/126 - 210/126 = 49 - 210/126 = -161/126
After reducing the fraction, the answer is -23/18

MathStep (Works offline)

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