Subtract 18/27 from 18/42
18/42 - 18/27 is -5/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 27 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 42 × 9 = 378,
18/42 = 18 × 9/42 × 9 = 162/378 - Likewise, for the 2nd fraction, since 27 × 14 = 378,
18/27 = 18 × 14/27 × 14 = 252/378 - Subtract the two like fractions:
162/378 - 252/378 = 162 - 252/378 = -90/378 - After reducing the fraction, the answer is -5/21
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