Subtract 3/20 from 6/81
6/81 - 3/20 is -41/540.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 20 is 1620
Next, find the equivalent fraction of both fractional numbers with denominator 1620 - For the 1st fraction, since 81 × 20 = 1620,
6/81 = 6 × 20/81 × 20 = 120/1620 - Likewise, for the 2nd fraction, since 20 × 81 = 1620,
3/20 = 3 × 81/20 × 81 = 243/1620 - Subtract the two like fractions:
120/1620 - 243/1620 = 120 - 243/1620 = -123/1620 - After reducing the fraction, the answer is -41/540
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