Subtract 3/63 from 81/2, Solve 40 1/2

Subtract 3/63 from 81/2

1^st number: 40 1/2, 2^nd number: 3/63

81/2 - 3/63 is 1699/42.

Find the least common denominator or LCM of the two denominators:
LCM of 2 and 63 is 126

Next, find the equivalent fraction of both fractional numbers with denominator 126
For the 1st fraction, since 2 × 63 = 126,
81/2 = 81 × 63/2 × 63 = 5103/126
Likewise, for the 2nd fraction, since 63 × 2 = 126,
3/63 = 3 × 2/63 × 2 = 6/126
Subtract the two like fractions:
5103/126 - 6/126 = 5103 - 6/126 = 5097/126
After reducing the fraction, the answer is 1699/42
In mixed form: 4019/42

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