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Best option is to use a calculator.

Failing that, use the Newton-Raphson method which entails making a guess at the answer and then improving on it. Repeating the procedure should lead to a better estimate at each stage.

To start with, if you want to find the square root of 405, define f(x) = x2 - 405.

Then finding the square root of 405 is equivalent to solving f(x) = 0.

Let f'(x) = 2x. This is the derivative of f(x) but you do not need to know that to use the N-R method.

Start with x0 as the first guess.

Then let xn+1 = xn - f(xn)/f'(xn) for n = 0, 1, 2, â€¦

After a few iterations, xn will be very close to the required square root.

If you start with 20, whose square is 400, the second iteration gives a result that is accurate to 8 decimal places.

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Q: How do you turn the square root of 405 into number or a decimal?

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The answer depends on what you consider to be a "regular" number.

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You put your feet up and chill! The number is already in decimal form!

Keep the whole-number-part exactly as it is, and re-write the decimal part as a fraction.

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You have to turn the percentage into a decimal.

You cannot. A mixed number, by definition, has a fractional part. In converting to a decimal number, you cannot get rid of that fractional part and so you can never convert it to a decimal integer.

You do nothing! A decimal number is simply a way of representing a number in such a way that the place value of each digit is ten times that of the digit to its right. A decimal representation does not require a decimal point. So, the number 13579, in decimal is 13579 - exactly as it was.

Turn it into an improper fraction. Then take the top number and divide it by the bottom for a decimal. Change that into a percent.

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The square root of a number is a number which, when multiplied by itself, yields that original number. *Special note: Recall that two positive numbers when multiplied together equal a positive number, and two negative numbers when multiplied together equal a positive number. Let's look at some examples and it will become clear. 4 x 4 = 16 and -4 x -4 = 16 therefore the square root of 16 is +4 or -4. 6 x 6 = 36 and -6 x -6 = 36 therefore the square root of 36 is +6 or -6. Simple and easy. The square root of a positive number is both a positive and a negative number. But the square root of a negative number presents another problem. We can't multiply two identical numbers together to get a negative number because of the *Special note. So how do we evaluate the square root of, say, -4? We can't do it "directly" so we have to do it this way: sq rt -4 = (sq rt 4) x (sq rt -1) Note that we "broke down" the -4 into 4 x -1 so we'd have "room to work" the problem. We can evaluate the sq rt of 4 and get +2 and -2, and we'll write the sq rt -1 as i. The italicised "i" is used to denote sq rt -1 and permit us to find the square root of a negative number, and that "i" is for "immaginary number" here. There is no real number that can be found which is the square root of a negative number. We can only "imagine" the square root of a negative number, and the "i" lets us at least write something so we can make calculations.

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23 can't be turned into a decimal it is a whole number you could turn it into a decimal if it was 23 1/2 that would be 23.5 but 23 as a decimal is 23

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