What is the reciprocal of 81/21? Here we will define reciprocal of 81/21, and show you how to calculate the reciprocal of 81/21 in fraction form and decimal form.
The reciprocal of 81/21 is a fraction or a number that when multiplied by 81/21 is equal to 1. To get the reciprocal of 81/21 based on that definition, we can make the following equation where "R" is the reciprocal of 81/21.
(81/21) × R = 1
When we solve for R, we get the answer to the reciprocal of 81/21 as a fraction as follows:
(81/21) × R = 1
R = 21/81
Reciprocal of 81/21 = 21/81
You can check that the answer is correct by confirming that 81/21 times the reciprocal of 81/21 is equal to 1, like this:
81/21 × 21/81 = 1
To find the decimal answer to the reciprocal of 81/21, you divide the numerator of the reciprocal by the demoninator of the reciprocal, like this:
21 ÷ 81 ≈ 0.259259259259
Reciprocal of 81/21 ≈ 0.259259259259
Tip: As you may have inferred from our tutorial above, you can quickly get the reciprocal of any fraction, such as 81/21, by switching the numerator and the denominator.
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Reciprocal of 81/22
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