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FutureStarrHow to Square a Number on Calculator OR
To square a number on a calculator, simply type the equality symbol and press Enter. For example, 2^4 equates to 16.
But square roots are not the only roots you can have. You can also have cube, or third, roots. When calculating the cube root of a number, you're looking for a number that, when multiplied by itself three times, results in the given number. For example, the cube root of 8 is 2 because 2 * 2 * 2 = 8. For the cube root, you'll write a little three in the upper left corner of your root symbol. You can also have fourth, fifth, sixth, or other integer roots, as long as they're a positive real number.
To calculate a square root, you'll use the square root button on your scientific calculator. To use this button, you'll need to know how your calculator operates. Some calculators have you input the number first and then push the square root button. Others have you push the square root button first followed by your number. So to find the square root of 5, for example, you'll push these buttons if your calculator has you input the number first. (Source: study.com)
For example, 4.5X4.5 = 20.25, so logically you should try a smaller number, probably 4.4. 4.4X4.4 = 19.36. Thus, the square root of 20 must lie in between 4.5 and 4.4. How about 4.445X4.445. That’s 19.758. It’s closer. If you keep trying different numbers using this process, you will eventually get to 4.475X4.475 = 20.03. Rounding off, that’s 20.
Sound complicated? It can be easiest to follow an example. For example, 10 lies in between the 2 perfect square numbers of 9 (3X3=9) and 16 (4X4=16). The square roots of those numbers are 3 and 4. So, divide 10 by the first number, 3. You will get 3.33. Now, average the 3 and 3.33 by adding them together and dividing them by 2. You will get 3.1667. Now take 10 divided by 3.1667. The answer is 3.1579. Now, average 3.1579 and 3.1667 by adding them together and dividing the sum you get by two. You will get 3.1623. (Source: www.wikihow.com)