Subtract 4/20 from 72/63, Solve 1 9/63

Subtract 4/20 from 72/63

1^st number: 1 9/63, 2^nd number: 4/20

72/63 - 4/20 is 33/35.

Find the least common denominator or LCM of the two denominators:
LCM of 63 and 20 is 1260

Next, find the equivalent fraction of both fractional numbers with denominator 1260
For the 1st fraction, since 63 × 20 = 1260,
72/63 = 72 × 20/63 × 20 = 1440/1260
Likewise, for the 2nd fraction, since 20 × 63 = 1260,
4/20 = 4 × 63/20 × 63 = 252/1260
Subtract the two like fractions:
1440/1260 - 252/1260 = 1440 - 252/1260 = 1188/1260
After reducing the fraction, the answer is 33/35

MathStep (Works offline)

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