Subtract 9/18 from 7/81
7/81 - 9/18 is -67/162.
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,
7/81 = 7 × 2/81 × 2 = 14/162 - Likewise, for the 2nd fraction, since 18 × 9 = 162,
9/18 = 9 × 9/18 × 9 = 81/162 - Subtract the two like fractions:
14/162 - 81/162 = 14 - 81/162 = -67/162
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