Subtract 63/4 from 90/63, Solve 1 27/63

Subtract 63/4 from 90/63

1^st number: 1 27/63, 2^nd number: 15 3/4

90/63 - 63/4 is -401/28.

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,
90/63 = 90 × 4/63 × 4 = 360/252
Likewise, for the 2nd fraction, since 4 × 63 = 252,
63/4 = 63 × 63/4 × 63 = 3969/252
Subtract the two like fractions:
360/252 - 3969/252 = 360 - 3969/252 = -3609/252
After reducing the fraction, the answer is -401/28

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