Subtract 15/4 from 72/63, Solve 1 9/63

Subtract 15/4 from 72/63

1^st number: 1 9/63, 2^nd number: 3 3/4

72/63 - 15/4 is -73/28.

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,
72/63 = 72 × 4/63 × 4 = 288/252
Likewise, for the 2nd fraction, since 4 × 63 = 252,
15/4 = 15 × 63/4 × 63 = 945/252
Subtract the two like fractions:
288/252 - 945/252 = 288 - 945/252 = -657/252
After reducing the fraction, the answer is -73/28

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