Multiply fractions by reciprocal: To divide one fraction by another, we multiply the first fraction by the reciprocal of the second fraction. 81÷21=81×12
Multiply numerators and denominators: Now, we multiply the numerators together and the denominators together.81×12=(8×1)(1×2)=82
Simplify fraction: The fraction 82 can be simplified by dividing both the numerator and the denominator by their greatest common divisor, which is 2. 82=8÷22÷2=41
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