Subtract 42/27 from 21/42
1st number: 21/42, 2nd number: 1 15/27
21/42 - 42/27 is -19/18.
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,
21/42 = 21 × 9/42 × 9 = 189/378 - Likewise, for the 2nd fraction, since 27 × 14 = 378,
42/27 = 42 × 14/27 × 14 = 588/378 - Subtract the two like fractions:
189/378 - 588/378 = 189 - 588/378 = -399/378 - After reducing the fraction, the answer is -19/18
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