Subtract 4/70 from 4/72, Solve 4/72

Subtract 4/70 from 4/72

4/72 - 4/70 is -1/630.

Find the least common denominator or LCM of the two denominators:
LCM of 72 and 70 is 2520

Next, find the equivalent fraction of both fractional numbers with denominator 2520
For the 1st fraction, since 72 × 35 = 2520,
4/72 = 4 × 35/72 × 35 = 140/2520
Likewise, for the 2nd fraction, since 70 × 36 = 2520,
4/70 = 4 × 36/70 × 36 = 144/2520
Subtract the two like fractions:
140/2520 - 144/2520 = 140 - 144/2520 = -4/2520
After reducing the fraction, the answer is -1/630

MathStep (Works offline)

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