Subtract 20/84 from 18/54
18/54 - 20/84 is 2/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 54 and 84 is 756
Next, find the equivalent fraction of both fractional numbers with denominator 756 - For the 1st fraction, since 54 × 14 = 756,
18/54 = 18 × 14/54 × 14 = 252/756 - Likewise, for the 2nd fraction, since 84 × 9 = 756,
20/84 = 20 × 9/84 × 9 = 180/756 - Subtract the two like fractions:
252/756 - 180/756 = 252 - 180/756 = 72/756 - After reducing the fraction, the answer is 2/21
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