Subtract 15/27 from 20/40
20/40 - 15/27 is -1/18.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 27 is 1080
Next, find the equivalent fraction of both fractional numbers with denominator 1080 - For the 1st fraction, since 40 × 27 = 1080,
20/40 = 20 × 27/40 × 27 = 540/1080 - Likewise, for the 2nd fraction, since 27 × 40 = 1080,
15/27 = 15 × 40/27 × 40 = 600/1080 - Subtract the two like fractions:
540/1080 - 600/1080 = 540 - 600/1080 = -60/1080 - After reducing the fraction, the answer is -1/18
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