Subtract 63/36 from 5/21, Solve 5/21

Subtract 63/36 from 5/21

1^st number: 5/21, 2^nd number: 1 27/36

5/21 - 63/36 is -127/84.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 36 is 252

Next, find the equivalent fraction of both fractional numbers with denominator 252
For the 1st fraction, since 21 × 12 = 252,
5/21 = 5 × 12/21 × 12 = 60/252
Likewise, for the 2nd fraction, since 36 × 7 = 252,
63/36 = 63 × 7/36 × 7 = 441/252
Subtract the two like fractions:
60/252 - 441/252 = 60 - 441/252 = -381/252
After reducing the fraction, the answer is -127/84

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