If the square root of 405, rounded to the nearest thousandth, is 20.125, how do you simplify to get to that answer? Thank you.

Question

Anonymous · Answer

405 ​ = 81 ⋅ 5 ​ = 81 ​ ⋅ 5 ​ = 9 5 ​ ≈ 9 ⋅ 2.23606 = 20.12454 ≈ 20.125

Anonymous · Answer

The square root of 405 can be simplified to 9 5 ​ , which approximates to 20.124611. When rounding to the nearest thousandth, it becomes 20.125. Therefore, 405 ​ rounded to three decimal places is 20.125. 
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If the square root of 405, rounded to the nearest thousandth, is 20.125, how do you simplify to get to that answer? Thank you.

Answer (2)

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