Subtract 70/54 from 90/81
1st number: 1 9/81, 2nd number: 1 16/54
90/81 - 70/54 is -5/27.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 54 is 162
Next, find the equivalent fraction of both fractional numbers with denominator 162 - For the 1st fraction, since 81 × 2 = 162,
90/81 = 90 × 2/81 × 2 = 180/162 - Likewise, for the 2nd fraction, since 54 × 3 = 162,
70/54 = 70 × 3/54 × 3 = 210/162 - Subtract the two like fractions:
180/162 - 210/162 = 180 - 210/162 = -30/162 - After reducing the fraction, the answer is -5/27
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