Subtract 15/54 from 30/40, Solve 30/40

Subtract 15/54 from 30/40

30/40 - 15/54 is 17/36.

Find the least common denominator or LCM of the two denominators:
LCM of 40 and 54 is 1080

Next, find the equivalent fraction of both fractional numbers with denominator 1080
For the 1st fraction, since 40 × 27 = 1080,
30/40 = 30 × 27/40 × 27 = 810/1080
Likewise, for the 2nd fraction, since 54 × 20 = 1080,
15/54 = 15 × 20/54 × 20 = 300/1080
Subtract the two like fractions:
810/1080 - 300/1080 = 810 - 300/1080 = 510/1080
After reducing the fraction, the answer is 17/36

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