Subtract 21/42 from 2/27
2/27 - 21/42 is -23/54.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 27 and 42 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 27 × 14 = 378,
2/27 = 2 × 14/27 × 14 = 28/378 - Likewise, for the 2nd fraction, since 42 × 9 = 378,
21/42 = 21 × 9/42 × 9 = 189/378 - Subtract the two like fractions:
28/378 - 189/378 = 28 - 189/378 = -161/378 - After reducing the fraction, the answer is -23/54
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