Simplify Square Root of 81990

Here we will show you two methods that you can use to simplify the square root of 81990. In other words, we will show you how to find the square root of 81990 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.

√81990 = A√B

Greatest Perfect Square Factor Method
The Greatest Perfect Square Factor Method uses the greatest perfect square factor of 81990 to simplify the square root of 81990. 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 81990. The factors of 81990 are 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90, 911, 1822, 2733, 4555, 5466, 8199, 9110, 13665, 16398, 27330, 40995, and 81990. Furthermore, the greatest perfect square on this list is 9 and the square root of 9 is 3. Therefore, A equals 3.

B = Calculate 81990 divided by the greatest perfect square from the list of all factors of 81990. We determined above that the greatest perfect square from the list of all factors of 81990 is 9. Furthermore, 81990 divided by 9 is 9110, therefore B equals 9110.

Now we have A and B and can get our answer to 81990 in its simplest radical form as follows:

√81990 = A√B

√81990 = 3√9110

Double Prime Factor Method
The Double Prime Factor Method uses the prime factors of 81990 to simplify the square root of 81990 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 81990 and then take the square root of that product. The prime factors that multiply together to make 81990 are 2 x 3 x 3 x 5 x 911. When we strip out the pairs only, we get 3 x 3 = 9 and the square root of 9 is 3. Therefore, A equals 3.

B = Divide 81990 by the number (A) squared. 3 squared is 9 and 81990 divided by 9 is 9110. Therefore, B equals 9110.

Once again we have A and B and can get our answer to 81990 in its simplest radical form as follows:

√81990 = A√B

√81990 = 3√9110

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