Subtract 15/70 from 8/72, Solve 8/72

Subtract 15/70 from 8/72

8/72 - 15/70 is -13/126.

Find the least common denominator or LCM of the two denominators:
LCM of 72 and 70 is 2520

Next, find the equivalent fraction of both fractional numbers with denominator 2520
For the 1st fraction, since 72 × 35 = 2520,
8/72 = 8 × 35/72 × 35 = 280/2520
Likewise, for the 2nd fraction, since 70 × 36 = 2520,
15/70 = 15 × 36/70 × 36 = 540/2520
Subtract the two like fractions:
280/2520 - 540/2520 = 280 - 540/2520 = -260/2520
After reducing the fraction, the answer is -13/126

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