Subtract 81/63 from 4/6, Solve 4/6 - 1 18/63 as a fraction

Subtract 81/63 from 4/6

1^st number: 4/6, 2^nd number: 1 18/63

4/6 - 81/63 is -13/21.

Find the least common denominator or LCM of the two denominators:
LCM of 6 and 63 is 126

Next, find the equivalent fraction of both fractional numbers with denominator 126
For the 1st fraction, since 6 × 21 = 126,
4/6 = 4 × 21/6 × 21 = 84/126
Likewise, for the 2nd fraction, since 63 × 2 = 126,
81/63 = 81 × 2/63 × 2 = 162/126
Subtract the two like fractions:
84/126 - 162/126 = 84 - 162/126 = -78/126
After reducing the fraction, the answer is -13/21

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