Subtract 27/54 from 3/21
3/21 - 27/54 is -5/14.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 54 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 21 × 18 = 378,
3/21 = 3 × 18/21 × 18 = 54/378 - Likewise, for the 2nd fraction, since 54 × 7 = 378,
27/54 = 27 × 7/54 × 7 = 189/378 - Subtract the two like fractions:
54/378 - 189/378 = 54 - 189/378 = -135/378 - After reducing the fraction, the answer is -5/14
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