Subtract 42/7 from 10/18, Solve 10/18

Subtract 42/7 from 10/18

1^st number: 10/18, 2^nd number: 6 0/7

10/18 - 42/7 is -49/9.

Find the least common denominator or LCM of the two denominators:
LCM of 18 and 7 is 126

Next, find the equivalent fraction of both fractional numbers with denominator 126
For the 1st fraction, since 18 × 7 = 126,
10/18 = 10 × 7/18 × 7 = 70/126
Likewise, for the 2nd fraction, since 7 × 18 = 126,
42/7 = 42 × 18/7 × 18 = 756/126
Subtract the two like fractions:
70/126 - 756/126 = 70 - 756/126 = -686/126
After reducing the fraction, the answer is -49/9

MathStep (Works offline)

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