Subtract 21/27 from 12/25, Solve 12/25

Subtract 21/27 from 12/25

12/25 - 21/27 is -67/225.

Find the least common denominator or LCM of the two denominators:
LCM of 25 and 27 is 675

Next, find the equivalent fraction of both fractional numbers with denominator 675
For the 1st fraction, since 25 × 27 = 675,
12/25 = 12 × 27/25 × 27 = 324/675
Likewise, for the 2nd fraction, since 27 × 25 = 675,
21/27 = 21 × 25/27 × 25 = 525/675
Subtract the two like fractions:
324/675 - 525/675 = 324 - 525/675 = -201/675
After reducing the fraction, the answer is -67/225

MathStep (Works offline)

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