Subtract 10/63 from 20/42, Solve 20/42

Subtract 10/63 from 20/42

20/42 - 10/63 is 20/63.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 63 is 126

Next, find the equivalent fraction of both fractional numbers with denominator 126
For the 1st fraction, since 42 × 3 = 126,
20/42 = 20 × 3/42 × 3 = 60/126
Likewise, for the 2nd fraction, since 63 × 2 = 126,
10/63 = 10 × 2/63 × 2 = 20/126
Subtract the two like fractions:
60/126 - 20/126 = 60 - 20/126 = 40/126
After reducing the fraction, the answer is 20/63

MathStep (Works offline)

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