Subtract 90/18 from 2/81
1st number: 2/81, 2nd number: 5 0/18
2/81 - 90/18 is -403/81.
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,
2/81 = 2 × 2/81 × 2 = 4/162 - Likewise, for the 2nd fraction, since 18 × 9 = 162,
90/18 = 90 × 9/18 × 9 = 810/162 - Subtract the two like fractions:
4/162 - 810/162 = 4 - 810/162 = -806/162 - After reducing the fraction, the answer is -403/81
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