Subtract 21/27 from 8/81
8/81 - 21/27 is -55/81.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 27 is 81
Next, find the equivalent fraction of both fractional numbers with denominator 81 - For the 1st fraction, since 81 × 1 = 81,
8/81 = 8 × 1/81 × 1 = 8/81 - Likewise, for the 2nd fraction, since 27 × 3 = 81,
21/27 = 21 × 3/27 × 3 = 63/81 - Subtract the two like fractions:
8/81 - 63/81 = 8 - 63/81 = -55/81
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