What is 3 divided by square root of 21? (3/√21)

3 divided by square root of 21

Here we will show you how to calculate 3 divided by the square root of 21. In fact, we will show you two different ways of calculating 3 divided by √21. We start by displaying the problem we are solving in mathematical terms, as follows:

3 ÷ √21 =

		3
		√21

Method 1
To solve the problem 3 divided by the square root of 21 using this method, we first find the square root of 21, and then we divide 3 by the answer to the square root of 21.

		3
		√21

≈

		3
		4.5825757

		3
		4.5825757

≈ 0.6546537

Method 2
With this alternate method, we first move the radical from the denominator to the numerator by multiplying the numerator and denominator by √21 like this.

		3 × √21
		√21 × √21

≈

		13.7477271
		21

Then we divide the numerator by the denominator to once again get the answer to 3 divided by the square root of 21.

		13.7477271
		21

≈ 0.6546537

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