Subtract 6/84 from 21/81
21/81 - 6/84 is 71/378.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 84 is 2268
Next, find the equivalent fraction of both fractional numbers with denominator 2268 - For the 1st fraction, since 81 × 28 = 2268,
21/81 = 21 × 28/81 × 28 = 588/2268 - Likewise, for the 2nd fraction, since 84 × 27 = 2268,
6/84 = 6 × 27/84 × 27 = 162/2268 - Subtract the two like fractions:
588/2268 - 162/2268 = 588 - 162/2268 = 426/2268 - After reducing the fraction, the answer is 71/378
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