Subtract 45/54 from 30/40
30/40 - 45/54 is -1/12.
Steps for subtracting fractions
- 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,
45/54 = 45 × 20/54 × 20 = 900/1080 - Subtract the two like fractions:
810/1080 - 900/1080 = 810 - 900/1080 = -90/1080 - After reducing the fraction, the answer is -1/12
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