Simplify Square Root of 21216

Here we will show you two methods that you can use to simplify the square root of 21216. In other words, we will show you how to find the square root of 21216 in its simplest radical form using two different methods.

To be more specific, we have created an illustration below showing what we want to calculate. Our goal is to make "A" outside the radical (√) as large as possible, and "B" inside the radical (√) as small as possible.

√21216 = A√B

Greatest Perfect Square Factor Method
The Greatest Perfect Square Factor Method uses the greatest perfect square factor of 21216 to simplify the square root of 21216. This is how to calculate A and B using this method:

A = Calculate the square root of the greatest perfect square from the list of all factors of 21216. The factors of 21216 are 1, 2, 3, 4, 6, 8, 12, 13, 16, 17, 24, 26, 32, 34, 39, 48, 51, 52, 68, 78, 96, 102, 104, 136, 156, 204, 208, 221, 272, 312, 408, 416, 442, 544, 624, 663, 816, 884, 1248, 1326, 1632, 1768, 2652, 3536, 5304, 7072, 10608, and 21216. Furthermore, the greatest perfect square on this list is 16 and the square root of 16 is 4. Therefore, A equals 4.

B = Calculate 21216 divided by the greatest perfect square from the list of all factors of 21216. We determined above that the greatest perfect square from the list of all factors of 21216 is 16. Furthermore, 21216 divided by 16 is 1326, therefore B equals 1326.

Now we have A and B and can get our answer to 21216 in its simplest radical form as follows:

√21216 = A√B

√21216 = 4√1326

Double Prime Factor Method
The Double Prime Factor Method uses the prime factors of 21216 to simplify the square root of 21216 to its simplest form possible. This is how to calculate A and B using this method:

A = Multiply all the double prime factors (pairs) of 21216 and then take the square root of that product. The prime factors that multiply together to make 21216 are 2 x 2 x 2 x 2 x 2 x 3 x 13 x 17. When we strip out the pairs only, we get 2 x 2 x 2 x 2 = 16 and the square root of 16 is 4. Therefore, A equals 4.

B = Divide 21216 by the number (A) squared. 4 squared is 16 and 21216 divided by 16 is 1326. Therefore, B equals 1326.

Once again we have A and B and can get our answer to 21216 in its simplest radical form as follows:

√21216 = A√B

√21216 = 4√1326

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