Subtract 90/75 from 9/8, Solve 1 1/8

Subtract 90/75 from 9/8

1^st number: 1 1/8, 2^nd number: 1 15/75

9/8 - 90/75 is -3/40.

Find the least common denominator or LCM of the two denominators:
LCM of 8 and 75 is 600

Next, find the equivalent fraction of both fractional numbers with denominator 600
For the 1st fraction, since 8 × 75 = 600,
9/8 = 9 × 75/8 × 75 = 675/600
Likewise, for the 2nd fraction, since 75 × 8 = 600,
90/75 = 90 × 8/75 × 8 = 720/600
Subtract the two like fractions:
675/600 - 720/600 = 675 - 720/600 = -45/600
After reducing the fraction, the answer is -3/40

MathStep (Works offline)

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