Subtract 6/12 from 7/90, Solve 7/90

Subtract 6/12 from 7/90

7/90 - 6/12 is -19/45.

Find the least common denominator or LCM of the two denominators:
LCM of 90 and 12 is 180

Next, find the equivalent fraction of both fractional numbers with denominator 180
For the 1st fraction, since 90 × 2 = 180,
7/90 = 7 × 2/90 × 2 = 14/180
Likewise, for the 2nd fraction, since 12 × 15 = 180,
6/12 = 6 × 15/12 × 15 = 90/180
Subtract the two like fractions:
14/180 - 90/180 = 14 - 90/180 = -76/180
After reducing the fraction, the answer is -19/45

MathStep (Works offline)

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