In reply to Rick Wicklin.

I also found a way to do sqrt, group numbers in pairs of 2 and then find closest, but not bigger than, square and double the number you squared and add 1 digit to it and multiply by the same number and do that until you have found the digit you multiply by and add that is closest, but not bigger than the difference between the square and S and then subtract, and add the “digit” to the “number” again and add the “digit” again and keep doing that until you get to the decimal place you desire.(write down “digits” you get for sqrt).

ADDENDUM: Sorry, I missed out a few things, before you subtract square and product from adding “digit” and multiplying “digit”, bring down the next pair to the end of the square and then subtract, if there are no other pairs, then bring down 2 zeros to square, and if you can substitute the digit with 1 and get a bigger number than the square, then add zeros to the square until it is bigger than the “product” and add as many zeros to sqrt and then subtract square and “product”.