Subtract 15/4 from 90/18, Solve 5 0/18

Subtract 15/4 from 90/18

1^st number: 5 0/18, 2^nd number: 3 3/4

90/18 - 15/4 is 5/4.

Find the least common denominator or LCM of the two denominators:
LCM of 18 and 4 is 36

Next, find the equivalent fraction of both fractional numbers with denominator 36
For the 1st fraction, since 18 × 2 = 36,
90/18 = 90 × 2/18 × 2 = 180/36
Likewise, for the 2nd fraction, since 4 × 9 = 36,
15/4 = 15 × 9/4 × 9 = 135/36
Subtract the two like fractions:
180/36 - 135/36 = 180 - 135/36 = 45/36
After reducing the fraction, the answer is 5/4
In mixed form: 11/4

MathStep (Works offline)

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