What is the reciprocal of 21/4? Here we will define reciprocal of 21/4, and show you how to calculate the reciprocal of 21/4 in fraction form and decimal form.
The reciprocal of 21/4 is a fraction or a number that when multiplied by 21/4 is equal to 1. To get the reciprocal of 21/4 based on that definition, we can make the following equation where "R" is the reciprocal of 21/4.
(21/4) × R = 1
When we solve for R, we get the answer to the reciprocal of 21/4 as a fraction as follows:
(21/4) × R = 1
R = 4/21
Reciprocal of 21/4 = 4/21
You can check that the answer is correct by confirming that 21/4 times the reciprocal of 21/4 is equal to 1, like this:
21/4 × 4/21 = 1
To find the decimal answer to the reciprocal of 21/4, you divide the numerator of the reciprocal by the demoninator of the reciprocal, like this:
4 ÷ 21 ≈ 0.190476190476
Reciprocal of 21/4 ≈ 0.190476190476
Tip: As you may have inferred from our tutorial above, you can quickly get the reciprocal of any fraction, such as 21/4, by switching the numerator and the denominator.
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Reciprocal of 21/5
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