Subtract 3/72 from 30/84, Solve 30/84

Subtract 3/72 from 30/84

30/84 - 3/72 is 53/168.

Find the least common denominator or LCM of the two denominators:
LCM of 84 and 72 is 504

Next, find the equivalent fraction of both fractional numbers with denominator 504
For the 1st fraction, since 84 × 6 = 504,
30/84 = 30 × 6/84 × 6 = 180/504
Likewise, for the 2nd fraction, since 72 × 7 = 504,
3/72 = 3 × 7/72 × 7 = 21/504
Subtract the two like fractions:
180/504 - 21/504 = 180 - 21/504 = 159/504
After reducing the fraction, the answer is 53/168

MathStep (Works offline)

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