Subtract 12/63 from 7/40, Solve 7/40

Subtract 12/63 from 7/40

7/40 - 12/63 is -13/840.

Find the least common denominator or LCM of the two denominators:
LCM of 40 and 63 is 2520

Next, find the equivalent fraction of both fractional numbers with denominator 2520
For the 1st fraction, since 40 × 63 = 2520,
7/40 = 7 × 63/40 × 63 = 441/2520
Likewise, for the 2nd fraction, since 63 × 40 = 2520,
12/63 = 12 × 40/63 × 40 = 480/2520
Subtract the two like fractions:
441/2520 - 480/2520 = 441 - 480/2520 = -39/2520
After reducing the fraction, the answer is -13/840

MathStep (Works offline)

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