Square Root of 690

The square root is the inverse of the square of the number. 690 is not a perfect square. The square root of 690 is expressed in both radical and exponential form. In the radical form, it is expressed as √690, whereas (690)^(1/2) in the exponential form. √690 = 26.267851, which is an irrational number because it cannot be expressed in the form of p/q, where p and q are integers and q ≠ 0.

The prime factorization method is used for perfect square numbers. However, the prime factorization method is not used for non-perfect square numbers where the long-division method and approximation method are used. Let us now learn the following methods:

• Prime factorization method
• Long division method
• Approximation method

The product of prime factors is the prime factorization of a number. Now let us look at how 690 is broken down into its prime factors.

Step 1: Finding the prime factors of 690

Breaking it down, we get 2 x 3 x 5 x 23: 2^1 x 3^1 x 5^1 x 23^1

Step 2: Now we found out the prime factors of 690. The second step is to make pairs of those prime factors. Since 690 is not a perfect square, the digits of the number can’t be grouped in pair. Therefore, calculating 690 using prime factorization is impossible.

The long division method is particularly used for non-perfect square numbers. In this method, we should check the closest perfect square number for the given number. Let us now learn how to find the square root using the long division method, step by step.

Step 1: To begin with, we need to group the numbers from right to left. In the case of 690, we need to group it as 90 and 6.

Step 2: Now we need to find n whose square is less than or equal to 6. We can say n is ‘2’ because 2 x 2 = 4, which is less than 6. Now the quotient is 2, and after subtracting 4 from 6, the remainder is 2.

Step 3: Now let us bring down 90, which is the new dividend. Add the old divisor with the same number 2 + 2, and we get 4, which will be our new divisor.

Step 4: The new divisor will be the sum of the dividend and the quotient. Now we get 4n as the new divisor, and we need to find the value of n.

Step 5: The next step is finding 4n x n ≤ 290. Let us consider n as 6, now 46 x 6 = 276.

Step 6: Subtracting 276 from 290, the difference is 14, and the quotient is 26.

Step 7: Since the dividend is less than the divisor, we need to add a decimal point. Adding the decimal point allows us to add two zeroes to the dividend. Now the new dividend is 1400.

Step 8: Now we need to find the new divisor that is 263 because 263 x 5 = 1315.

Step 9: Subtracting 1315 from 1400, we get the result 85.

Step 10: Now the quotient is 26.5.

Step 11: Continue doing these steps until we get two numbers after the decimal point. Suppose if there is no decimal value, continue till the remainder is zero.

So the square root of √690 is approximately 26.26.

The approximation method is another method for finding the square roots. It is an easy method to find the square root of a given number. Now let us learn how to find the square root of 690 using the approximation method.

Step 1: Now we have to find the closest perfect square of √690. The smallest perfect square less than 690 is 676, and the largest perfect square greater than 690 is 729. √690 falls somewhere between 26 and 27.

Step 2: Now we need to apply the formula that is (Given number - smallest perfect square) ÷ (Greater perfect square - smallest perfect square). Going by the formula (690 - 676) ÷ (729 - 676) = 14 ÷ 53 ≈ 0.2642. Using the formula, we identified the decimal point of our square root. The next step is adding the value we got initially to the decimal number which is 26 + 0.2642 = 26.2642.

So the square root of 690 is approximately 26.26.

• Square root: A square root is the inverse of a square. Example: 4^2 = 16, and the inverse of the square is the square root that is √16 = 4.

• Irrational number: An irrational number is a number that cannot be written in the form of p/q, where q is not equal to zero, and p and q are integers.

• Principal square root: A number has both positive and negative square roots. However, it is always the positive square root that has more prominence due to its uses in the real world. That is the reason it is also known as the principal square root.

• Prime factorization: The process of expressing a number as a product of its prime factors.

• Long division method: A method used to find the square roots of numbers that are not perfect squares by dividing, multiplying, and subtracting in sequential steps.