Subtract 40/80 from 36/42, Solve 36/42

Subtract 40/80 from 36/42

36/42 - 40/80 is 5/14.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 80 is 1680

Next, find the equivalent fraction of both fractional numbers with denominator 1680
For the 1st fraction, since 42 × 40 = 1680,
36/42 = 36 × 40/42 × 40 = 1440/1680
Likewise, for the 2nd fraction, since 80 × 21 = 1680,
40/80 = 40 × 21/80 × 21 = 840/1680
Subtract the two like fractions:
1440/1680 - 840/1680 = 1440 - 840/1680 = 600/1680
After reducing the fraction, the answer is 5/14

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