What number multiplied by itself equals 408?

Here we will answer: What number multiplied by itself gives 408? In other words, what number times itself will equal 408?

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 = 408
x ≈ 20.199

Square Root Method:
Take the square root of 408 to get the answer:

√408 ≈ 20.199

Exponent Method:
Make the base 408 and the exponent 0.5 to get the answer:

408^0.5 ≈ 20.199

There you go! Now you know how to calculate "What number multiplied by itself equals 408?"

The bottom line is that 20.199 times itself equals approximately 408 as illustrated here:

20.199 x 20.199 ≈ 408

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