Subtract 10/8 from 18/70, Solve 18/70

Subtract 10/8 from 18/70

1^st number: 18/70, 2^nd number: 1 2/8

18/70 - 10/8 is -139/140.

Find the least common denominator or LCM of the two denominators:
LCM of 70 and 8 is 280

Next, find the equivalent fraction of both fractional numbers with denominator 280
For the 1st fraction, since 70 × 4 = 280,
18/70 = 18 × 4/70 × 4 = 72/280
Likewise, for the 2nd fraction, since 8 × 35 = 280,
10/8 = 10 × 35/8 × 35 = 350/280
Subtract the two like fractions:
72/280 - 350/280 = 72 - 350/280 = -278/280
After reducing the fraction, the answer is -139/140

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