Subtract 18/63 from 20/49, Solve 20/49

Subtract 18/63 from 20/49

20/49 - 18/63 is 6/49.

Find the least common denominator or LCM of the two denominators:
LCM of 49 and 63 is 441

Next, find the equivalent fraction of both fractional numbers with denominator 441
For the 1st fraction, since 49 × 9 = 441,
20/49 = 20 × 9/49 × 9 = 180/441
Likewise, for the 2nd fraction, since 63 × 7 = 441,
18/63 = 18 × 7/63 × 7 = 126/441
Subtract the two like fractions:
180/441 - 126/441 = 180 - 126/441 = 54/441
After reducing the fraction, the answer is 6/49

MathStep (Works offline)

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