Subtract 81/7 from 4/18, Solve 4/18

Subtract 81/7 from 4/18

1^st number: 4/18, 2^nd number: 11 4/7

4/18 - 81/7 is -715/63.

Find the least common denominator or LCM of the two denominators:
LCM of 18 and 7 is 126

Next, find the equivalent fraction of both fractional numbers with denominator 126
For the 1st fraction, since 18 × 7 = 126,
4/18 = 4 × 7/18 × 7 = 28/126
Likewise, for the 2nd fraction, since 7 × 18 = 126,
81/7 = 81 × 18/7 × 18 = 1458/126
Subtract the two like fractions:
28/126 - 1458/126 = 28 - 1458/126 = -1430/126
After reducing the fraction, the answer is -715/63

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