Subtract 56/7 from 15/18, Solve 15/18

Subtract 56/7 from 15/18

1^st number: 15/18, 2^nd number: 8 0/7

15/18 - 56/7 is -43/6.

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,
15/18 = 15 × 7/18 × 7 = 105/126
Likewise, for the 2nd fraction, since 7 × 18 = 126,
56/7 = 56 × 18/7 × 18 = 1008/126
Subtract the two like fractions:
105/126 - 1008/126 = 105 - 1008/126 = -903/126
After reducing the fraction, the answer is -43/6

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