Subtract 84/72 from 1/7, Solve 1/7 - 1 12/72 as a fraction

Subtract 84/72 from 1/7

1^st number: 1/7, 2^nd number: 1 12/72

1/7 - 84/72 is -43/42.

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

Next, find the equivalent fraction of both fractional numbers with denominator 504
For the 1st fraction, since 7 × 72 = 504,
1/7 = 1 × 72/7 × 72 = 72/504
Likewise, for the 2nd fraction, since 72 × 7 = 504,
84/72 = 84 × 7/72 × 7 = 588/504
Subtract the two like fractions:
72/504 - 588/504 = 72 - 588/504 = -516/504
After reducing the fraction, the answer is -43/42

MathStep (Works offline)

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