Subtract 27/81 from 2/21
2/21 - 27/81 is -5/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 81 is 567
Next, find the equivalent fraction of both fractional numbers with denominator 567 - For the 1st fraction, since 21 × 27 = 567,
2/21 = 2 × 27/21 × 27 = 54/567 - Likewise, for the 2nd fraction, since 81 × 7 = 567,
27/81 = 27 × 7/81 × 7 = 189/567 - Subtract the two like fractions:
54/567 - 189/567 = 54 - 189/567 = -135/567 - After reducing the fraction, the answer is -5/21
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