Subtract 4/18 from 4/81
4/81 - 4/18 is -14/81.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 18 is 162
Next, find the equivalent fraction of both fractional numbers with denominator 162 - For the 1st fraction, since 81 × 2 = 162,
4/81 = 4 × 2/81 × 2 = 8/162 - Likewise, for the 2nd fraction, since 18 × 9 = 162,
4/18 = 4 × 9/18 × 9 = 36/162 - Subtract the two like fractions:
8/162 - 36/162 = 8 - 36/162 = -28/162 - After reducing the fraction, the answer is -14/81
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