What number multiplied by itself equals 18?

Here we will answer: What number multiplied by itself gives 18? In other words, what number times itself will equal 18?

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 = 18
x ≈ 4.243

Square Root Method:
Take the square root of 18 to get the answer:

√18 ≈ 4.243

Exponent Method:
Make the base 18 and the exponent 0.5 to get the answer:

18^0.5 ≈ 4.243

There you go! Now you know how to calculate "What number multiplied by itself equals 18?"

The bottom line is that 4.243 times itself equals approximately 18 as illustrated here:

4.243 x 4.243 ≈ 18

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