Subtract 18/84 from 21/27
21/27 - 18/84 is 71/126.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 27 and 84 is 756
Next, find the equivalent fraction of both fractional numbers with denominator 756 - For the 1st fraction, since 27 × 28 = 756,
21/27 = 21 × 28/27 × 28 = 588/756 - Likewise, for the 2nd fraction, since 84 × 9 = 756,
18/84 = 18 × 9/84 × 9 = 162/756 - Subtract the two like fractions:
588/756 - 162/756 = 588 - 162/756 = 426/756 - After reducing the fraction, the answer is 71/126
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