Subtract 45/54 from 84/63, Solve 1 21/63

Subtract 45/54 from 84/63

1^st number: 1 21/63, 2^nd number: 45/54

84/63 - 45/54 is 1/2.

Find the least common denominator or LCM of the two denominators:
LCM of 63 and 54 is 378

Next, find the equivalent fraction of both fractional numbers with denominator 378
For the 1st fraction, since 63 × 6 = 378,
84/63 = 84 × 6/63 × 6 = 504/378
Likewise, for the 2nd fraction, since 54 × 7 = 378,
45/54 = 45 × 7/54 × 7 = 315/378
Subtract the two like fractions:
504/378 - 315/378 = 504 - 315/378 = 189/378
After reducing the fraction, the answer is 1/2

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