Subtract 25/27 from 15/40, Solve 15/40

Subtract 25/27 from 15/40

15/40 - 25/27 is -119/216.

Find the least common denominator or LCM of the two denominators:
LCM of 40 and 27 is 1080

Next, find the equivalent fraction of both fractional numbers with denominator 1080
For the 1st fraction, since 40 × 27 = 1080,
15/40 = 15 × 27/40 × 27 = 405/1080
Likewise, for the 2nd fraction, since 27 × 40 = 1080,
25/27 = 25 × 40/27 × 40 = 1000/1080
Subtract the two like fractions:
405/1080 - 1000/1080 = 405 - 1000/1080 = -595/1080
After reducing the fraction, the answer is -119/216

MathStep (Works offline)

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