Subtract 3/18 from 6/81
6/81 - 3/18 is -5/54.
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,
6/81 = 6 × 2/81 × 2 = 12/162 - Likewise, for the 2nd fraction, since 18 × 9 = 162,
3/18 = 3 × 9/18 × 9 = 27/162 - Subtract the two like fractions:
12/162 - 27/162 = 12 - 27/162 = -15/162 - After reducing the fraction, the answer is -5/54
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