What number multiplied by itself equals 405?

Here we will answer: What number multiplied by itself gives 405? In other words, what number times itself will equal 405?

We have identified many different ways of getting the answer to this question:

Algebra Method:
Make an algebra equation and solve for x:

x • x = 405
x ≈ 20.125

Square Root Method:
Take the square root of 405 to get the answer:

√405 ≈ 20.125

Exponent Method:
Make the base 405 and the exponent 0.5 to get the answer:

405^0.5 ≈ 20.125

There you go! Now you know how to calculate "What number multiplied by itself equals 405?"

The bottom line is that 20.125 times itself equals approximately 405 as illustrated here:

20.125 x 20.125 ≈ 405

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The answer on this page is rounded to the nearest thousandth, if necessary.