Subtract 42/7 from 4/72, Solve 4/72

Subtract 42/7 from 4/72

1^st number: 4/72, 2^nd number: 6 0/7

4/72 - 42/7 is -107/18.

Find the least common denominator or LCM of the two denominators:
LCM of 72 and 7 is 504

Next, find the equivalent fraction of both fractional numbers with denominator 504
For the 1st fraction, since 72 × 7 = 504,
4/72 = 4 × 7/72 × 7 = 28/504
Likewise, for the 2nd fraction, since 7 × 72 = 504,
42/7 = 42 × 72/7 × 72 = 3024/504
Subtract the two like fractions:
28/504 - 3024/504 = 28 - 3024/504 = -2996/504
After reducing the fraction, the answer is -107/18

MathStep (Works offline)

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