Subtract 42/54 from 27/80, Solve 27/80

Subtract 42/54 from 27/80

27/80 - 42/54 is -317/720.

Find the least common denominator or LCM of the two denominators:
LCM of 80 and 54 is 2160

Next, find the equivalent fraction of both fractional numbers with denominator 2160
For the 1st fraction, since 80 × 27 = 2160,
27/80 = 27 × 27/80 × 27 = 729/2160
Likewise, for the 2nd fraction, since 54 × 40 = 2160,
42/54 = 42 × 40/54 × 40 = 1680/2160
Subtract the two like fractions:
729/2160 - 1680/2160 = 729 - 1680/2160 = -951/2160
After reducing the fraction, the answer is -317/720

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