I do square roots "visually", since that's how my head works. Get the closest square that's less than the number, subtract the difference, and then "visually" s

I do square roots "visually", since that's how my head works. Get the closest square that's less than the number, subtract the difference, and then "visually" spread them out over the two sides. That gets me to within two decimal places usually, which is generally good enough for whatever I'm trying to do in my head. Also, I do left-to-right math too (or, "most significant first"). I did it that way when I first learned math, and then public schooling spent years teaching me not to do it that way, and finally I got good at it again a few years after graduation. It's a much better way of handling math. I wish it was taught instead of the silly right-to-left nonsense.