Subtract 72/70 from 10/18, Solve 10/18

Subtract 72/70 from 10/18

1^st number: 10/18, 2^nd number: 1 2/70

10/18 - 72/70 is -149/315.

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,
10/18 = 10 × 35/18 × 35 = 350/630
Likewise, for the 2nd fraction, since 70 × 9 = 630,
72/70 = 72 × 9/70 × 9 = 648/630
Subtract the two like fractions:
350/630 - 648/630 = 350 - 648/630 = -298/630
After reducing the fraction, the answer is -149/315

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