Subtract 84/36 from 4/42, Solve 4/42

Subtract 84/36 from 4/42

1^st number: 4/42, 2^nd number: 2 12/36

4/42 - 84/36 is -47/21.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 36 is 252

Next, find the equivalent fraction of both fractional numbers with denominator 252
For the 1st fraction, since 42 × 6 = 252,
4/42 = 4 × 6/42 × 6 = 24/252
Likewise, for the 2nd fraction, since 36 × 7 = 252,
84/36 = 84 × 7/36 × 7 = 588/252
Subtract the two like fractions:
24/252 - 588/252 = 24 - 588/252 = -564/252
After reducing the fraction, the answer is -47/21

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