Subtract 81/70 from 5/18, Solve 5/18

Subtract 81/70 from 5/18

1^st number: 5/18, 2^nd number: 1 11/70

5/18 - 81/70 is -277/315.

Find the least common denominator or LCM of the two denominators:
LCM of 18 and 70 is 630

Next, find the equivalent fraction of both fractional numbers with denominator 630
For the 1st fraction, since 18 × 35 = 630,
5/18 = 5 × 35/18 × 35 = 175/630
Likewise, for the 2nd fraction, since 70 × 9 = 630,
81/70 = 81 × 9/70 × 9 = 729/630
Subtract the two like fractions:
175/630 - 729/630 = 175 - 729/630 = -554/630
After reducing the fraction, the answer is -277/315

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