Perfect squares are numbers whose square roots are whole numbers. return 2 * Math.sqrt(num); or return 2 * Math.pow(num, 0.5) - do you even know what a square root is? 3 squared is 9, so a square root of 9 is 3. It is easy to find the root of perfect squares, but for non-perfect squares, we have to use the long division method to find the root value. The square root of a number is a value that, when multiplied by itself, gives the number. First, to square a number, multiply the number by itself. thanks guys. We are calculating square root only for positive numbers. – Jaromanda X May 22 '17 at 2:40 I suspect he means cube root. Estimate the square root Now, to find the square root of the number we are finding the number raised to the power_ 0.5. This simplest way is to use the bisection method. Find the square root of 576. Numbers like 2, 3, 5, 20, etc. Find the closest perfect squares. – shmosel May 22 '17 at 2:42 These numbers are perfect squares: 4, 9, 16, 25, 36. To generate a close approximation of the square root of a non-perfect square, determine which two perfect squares the number lies between. For example, if the number is 21, it lies between the perfect squares 16 and 25. To find the square root this number, first we have to split this into two groups. The square root of 256 is 16 but if you were asked to find the square root of 256 and didn't know the answer how would you work it out? Note: to insert a caret ^ symbol, press SHIFT + 6. A square root is the number that, times itself, produces a given number. It will give us the square root of the number. If the number is not a perfect square, continue to the next steps. If it is negative, prompt the user to enter a valid number. To find the square root value of a number, we usually check if the number is a perfect square or not. That was interesting! Square root of 576. A square root of a number … are non-perfect squares, but 4, 9, 25, etc. Source(s): find square root number: https://shortly.im/jgcrN Check if the number is a negative number. Here’s the simple idea behind the bisection method. A square root goes the other way:. Square Roots. For example, 4 * 4 = 16 or 4^2 = 16. (Newton’s method is much faster and is given below but requires some calculus to understand how it is derived). When we square a negative number we get a positive result.. Just the same as squaring a positive number: (For more detail read Squares and Square Roots in Algebra) . The SQRT function in Excel returns the square root of a number.. 1. Let us learn trick to find square root of large numbers.