Subtract 81/27 from 20/18
1st number: 1 2/18, 2nd number: 3 0/27
20/18 - 81/27 is -17/9.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 27 is 54
Next, find the equivalent fraction of both fractional numbers with denominator 54 - For the 1st fraction, since 18 × 3 = 54,
20/18 = 20 × 3/18 × 3 = 60/54 - Likewise, for the 2nd fraction, since 27 × 2 = 54,
81/27 = 81 × 2/27 × 2 = 162/54 - Subtract the two like fractions:
60/54 - 162/54 = 60 - 162/54 = -102/54 - After reducing the fraction, the answer is -17/9
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