Subtract 9/21 from 36/45, Solve 36/45

Subtract 9/21 from 36/45

36/45 - 9/21 is 13/35.

Find the least common denominator or LCM of the two denominators:
LCM of 45 and 21 is 315

Next, find the equivalent fraction of both fractional numbers with denominator 315
For the 1st fraction, since 45 × 7 = 315,
36/45 = 36 × 7/45 × 7 = 252/315
Likewise, for the 2nd fraction, since 21 × 15 = 315,
9/21 = 9 × 15/21 × 15 = 135/315
Subtract the two like fractions:
252/315 - 135/315 = 252 - 135/315 = 117/315
After reducing the fraction, the answer is 13/35

MathStep (Works offline)

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