Simplify Square Root of 18720

Here we will show you two methods that you can use to simplify the square root of 18720. In other words, we will show you how to find the square root of 18720 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.

√18720 = A√B

Greatest Perfect Square Factor Method
The Greatest Perfect Square Factor Method uses the greatest perfect square factor of 18720 to simplify the square root of 18720. 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 18720. The factors of 18720 are 1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 13, 15, 16, 18, 20, 24, 26, 30, 32, 36, 39, 40, 45, 48, 52, 60, 65, 72, 78, 80, 90, 96, 104, 117, 120, 130, 144, 156, 160, 180, 195, 208, 234, 240, 260, 288, 312, 360, 390, 416, 468, 480, 520, 585, 624, 720, 780, 936, 1040, 1170, 1248, 1440, 1560, 1872, 2080, 2340, 3120, 3744, 4680, 6240, 9360, and 18720. Furthermore, the greatest perfect square on this list is 144 and the square root of 144 is 12. Therefore, A equals 12.

B = Calculate 18720 divided by the greatest perfect square from the list of all factors of 18720. We determined above that the greatest perfect square from the list of all factors of 18720 is 144. Furthermore, 18720 divided by 144 is 130, therefore B equals 130.

Now we have A and B and can get our answer to 18720 in its simplest radical form as follows:

√18720 = A√B

√18720 = 12√130

Double Prime Factor Method
The Double Prime Factor Method uses the prime factors of 18720 to simplify the square root of 18720 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 18720 and then take the square root of that product. The prime factors that multiply together to make 18720 are 2 x 2 x 2 x 2 x 2 x 3 x 3 x 5 x 13. When we strip out the pairs only, we get 2 x 2 x 2 x 2 x 3 x 3 = 144 and the square root of 144 is 12. Therefore, A equals 12.

B = Divide 18720 by the number (A) squared. 12 squared is 144 and 18720 divided by 144 is 130. Therefore, B equals 130.

Once again we have A and B and can get our answer to 18720 in its simplest radical form as follows:

√18720 = A√B

√18720 = 12√130

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