Subtract 21/18 from 4/56, Solve 4/56

Subtract 21/18 from 4/56

1^st number: 4/56, 2^nd number: 1 3/18

4/56 - 21/18 is -23/21.

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,
4/56 = 4 × 9/56 × 9 = 36/504
Likewise, for the 2nd fraction, since 18 × 28 = 504,
21/18 = 21 × 28/18 × 28 = 588/504
Subtract the two like fractions:
36/504 - 588/504 = 36 - 588/504 = -552/504
After reducing the fraction, the answer is -23/21

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