Subtract 84/81 from 10/20
1st number: 10/20, 2nd number: 1 3/81
10/20 - 84/81 is -29/54.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 81 is 1620
Next, find the equivalent fraction of both fractional numbers with denominator 1620 - For the 1st fraction, since 20 × 81 = 1620,
10/20 = 10 × 81/20 × 81 = 810/1620 - Likewise, for the 2nd fraction, since 81 × 20 = 1620,
84/81 = 84 × 20/81 × 20 = 1680/1620 - Subtract the two like fractions:
810/1620 - 1680/1620 = 810 - 1680/1620 = -870/1620 - After reducing the fraction, the answer is -29/54
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