Subtract 45/25 from 9/72, Solve 9/72

Subtract 45/25 from 9/72

1^st number: 9/72, 2^nd number: 1 20/25

9/72 - 45/25 is -67/40.

Find the least common denominator or LCM of the two denominators:
LCM of 72 and 25 is 1800

Next, find the equivalent fraction of both fractional numbers with denominator 1800
For the 1st fraction, since 72 × 25 = 1800,
9/72 = 9 × 25/72 × 25 = 225/1800
Likewise, for the 2nd fraction, since 25 × 72 = 1800,
45/25 = 45 × 72/25 × 72 = 3240/1800
Subtract the two like fractions:
225/1800 - 3240/1800 = 225 - 3240/1800 = -3015/1800
After reducing the fraction, the answer is -67/40

MathStep (Works offline)

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