Subtract 72/18 from 12/56, Solve 12/56

Subtract 72/18 from 12/56

1^st number: 12/56, 2^nd number: 4 0/18

12/56 - 72/18 is -53/14.

Find the least common denominator or LCM of the two denominators:
LCM of 56 and 18 is 504

Next, find the equivalent fraction of both fractional numbers with denominator 504
For the 1st fraction, since 56 × 9 = 504,
12/56 = 12 × 9/56 × 9 = 108/504
Likewise, for the 2nd fraction, since 18 × 28 = 504,
72/18 = 72 × 28/18 × 28 = 2016/504
Subtract the two like fractions:
108/504 - 2016/504 = 108 - 2016/504 = -1908/504
After reducing the fraction, the answer is -53/14

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