Subtract 10/70 from 4/72, Solve 4/72

Subtract 10/70 from 4/72

4/72 - 10/70 is -11/126.

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,
4/72 = 4 × 35/72 × 35 = 140/2520
Likewise, for the 2nd fraction, since 70 × 36 = 2520,
10/70 = 10 × 36/70 × 36 = 360/2520
Subtract the two like fractions:
140/2520 - 360/2520 = 140 - 360/2520 = -220/2520
After reducing the fraction, the answer is -11/126

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