What is 91 divided by square root of 21? (91/√21)

91 divided by square root of 21

Here we will show you how to calculate 91 divided by the square root of 21. In fact, we will show you two different ways of calculating 91 divided by √21. We start by displaying the problem we are solving in mathematical terms, as follows:

91 ÷ √21 =

		91
		√21

Method 1
To solve the problem 91 divided by the square root of 21 using this method, we first find the square root of 21, and then we divide 91 by the answer to the square root of 21.

		91
		√21

≈

		91
		4.5825757

		91
		4.5825757

≈ 19.8578280

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.

		91 × √21
		√21 × √21

≈

		417.0143882
		21

Then we divide the numerator by the denominator to once again get the answer to 91 divided by the square root of 21.

		417.0143882
		21

≈ 19.8578280

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