Subtract 14/12 from 30/90, Solve 30/90

Subtract 14/12 from 30/90

1^st number: 30/90, 2^nd number: 1 2/12

30/90 - 14/12 is -5/6.

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,
30/90 = 30 × 2/90 × 2 = 60/180
Likewise, for the 2nd fraction, since 12 × 15 = 180,
14/12 = 14 × 15/12 × 15 = 210/180
Subtract the two like fractions:
60/180 - 210/180 = 60 - 210/180 = -150/180
After reducing the fraction, the answer is -5/6

MathStep (Works offline)

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