Subtract 18/72 from 18/14, Solve 1 4/14

Subtract 18/72 from 18/14

1^st number: 1 4/14, 2^nd number: 18/72

18/14 - 18/72 is 29/28.

Find the least common denominator or LCM of the two denominators:
LCM of 14 and 72 is 504

Next, find the equivalent fraction of both fractional numbers with denominator 504
For the 1st fraction, since 14 × 36 = 504,
18/14 = 18 × 36/14 × 36 = 648/504
Likewise, for the 2nd fraction, since 72 × 7 = 504,
18/72 = 18 × 7/72 × 7 = 126/504
Subtract the two like fractions:
648/504 - 126/504 = 648 - 126/504 = 522/504
After reducing the fraction, the answer is 29/28
In mixed form: 11/28

MathStep (Works offline)

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