Subtract 20/40 from 7/27, Solve 7/27

Subtract 20/40 from 7/27

7/27 - 20/40 is -13/54.

Find the least common denominator or LCM of the two denominators:
LCM of 27 and 40 is 1080

Next, find the equivalent fraction of both fractional numbers with denominator 1080
For the 1st fraction, since 27 × 40 = 1080,
7/27 = 7 × 40/27 × 40 = 280/1080
Likewise, for the 2nd fraction, since 40 × 27 = 1080,
20/40 = 20 × 27/40 × 27 = 540/1080
Subtract the two like fractions:
280/1080 - 540/1080 = 280 - 540/1080 = -260/1080
After reducing the fraction, the answer is -13/54

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