Subtract 63/21 from 27/60, Solve 27/60

Subtract 63/21 from 27/60

1^st number: 27/60, 2^nd number: 3 0/21

27/60 - 63/21 is -51/20.

Find the least common denominator or LCM of the two denominators:
LCM of 60 and 21 is 420

Next, find the equivalent fraction of both fractional numbers with denominator 420
For the 1st fraction, since 60 × 7 = 420,
27/60 = 27 × 7/60 × 7 = 189/420
Likewise, for the 2nd fraction, since 21 × 20 = 420,
63/21 = 63 × 20/21 × 20 = 1260/420
Subtract the two like fractions:
189/420 - 1260/420 = 189 - 1260/420 = -1071/420
After reducing the fraction, the answer is -51/20

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