How do you get the square root without a calculator? - Answers

If you want to square something without a calculator you must take the # and estimate between which whole # the square root would be between. The two numbers it is between and multiply them by there selves (like 3 times 3 and 7 times 7, not 3 times 7). What ever the sums of those two numbers you subtract(9 and 49 which you subtract equaling 40). Then you divide the # by 100 equaling 2.5 which you multiply by the time 9 (which you saw in parentheses earlier), then with that sum you divide by 100. Then add that to three (which was your estimate. If the number is very long and complicated just round it to a whole #. 3 and 7 are just examples. Normally, both numbers would be right before and after the #. Like 5 and 7. If the number is a decimal like 3.45 your numbers would be 3 and 4. I am only 12 years old and I invented this as a simple way to solve square rooting technique!