Subtract 6/4 from 21/63, Solve 21/63

Subtract 6/4 from 21/63

1^st number: 21/63, 2^nd number: 1 2/4

21/63 - 6/4 is -7/6.

Find the least common denominator or LCM of the two denominators:
LCM of 63 and 4 is 252

Next, find the equivalent fraction of both fractional numbers with denominator 252
For the 1st fraction, since 63 × 4 = 252,
21/63 = 21 × 4/63 × 4 = 84/252
Likewise, for the 2nd fraction, since 4 × 63 = 252,
6/4 = 6 × 63/4 × 63 = 378/252
Subtract the two like fractions:
84/252 - 378/252 = 84 - 378/252 = -294/252
After reducing the fraction, the answer is -7/6

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