Subtract 7/81 from 2/84
2/84 - 7/81 is -71/1134.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 81 is 2268
Next, find the equivalent fraction of both fractional numbers with denominator 2268 - For the 1st fraction, since 84 × 27 = 2268,
2/84 = 2 × 27/84 × 27 = 54/2268 - Likewise, for the 2nd fraction, since 81 × 28 = 2268,
7/81 = 7 × 28/81 × 28 = 196/2268 - Subtract the two like fractions:
54/2268 - 196/2268 = 54 - 196/2268 = -142/2268 - After reducing the fraction, the answer is -71/1134
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