Subtract 2/20 from 2/81
2/81 - 2/20 is -61/810.
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,
2/81 = 2 × 20/81 × 20 = 40/1620 - Likewise, for the 2nd fraction, since 20 × 81 = 1620,
2/20 = 2 × 81/20 × 81 = 162/1620 - Subtract the two like fractions:
40/1620 - 162/1620 = 40 - 162/1620 = -122/1620 - After reducing the fraction, the answer is -61/810
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