Subtract 4/80 from 15/84, Solve 15/84

Subtract 4/80 from 15/84

15/84 - 4/80 is 9/70.

Find the least common denominator or LCM of the two denominators:
LCM of 84 and 80 is 1680

Next, find the equivalent fraction of both fractional numbers with denominator 1680
For the 1st fraction, since 84 × 20 = 1680,
15/84 = 15 × 20/84 × 20 = 300/1680
Likewise, for the 2nd fraction, since 80 × 21 = 1680,
4/80 = 4 × 21/80 × 21 = 84/1680
Subtract the two like fractions:
300/1680 - 84/1680 = 300 - 84/1680 = 216/1680
After reducing the fraction, the answer is 9/70

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