Subtract 18/24 from 3/81
3/81 - 18/24 is -77/108.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 24 is 648
Next, find the equivalent fraction of both fractional numbers with denominator 648 - For the 1st fraction, since 81 × 8 = 648,
3/81 = 3 × 8/81 × 8 = 24/648 - Likewise, for the 2nd fraction, since 24 × 27 = 648,
18/24 = 18 × 27/24 × 27 = 486/648 - Subtract the two like fractions:
24/648 - 486/648 = 24 - 486/648 = -462/648 - After reducing the fraction, the answer is -77/108
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