Subtract 7/18 from 30/81
30/81 - 7/18 is -1/54.
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,
30/81 = 30 × 2/81 × 2 = 60/162 - Likewise, for the 2nd fraction, since 18 × 9 = 162,
7/18 = 7 × 9/18 × 9 = 63/162 - Subtract the two like fractions:
60/162 - 63/162 = 60 - 63/162 = -3/162 - After reducing the fraction, the answer is -1/54
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