I can still remember (with a bit of pencil-and-paper refreshing) a longhand-division-like method for calculation of square roots by hand to arbitrary precision. yesterday I learned of a method for cube roots based on the equation:
(10a + b)³ = 1000a³ + b(300a² + 30ab + b²)
it's extremely tedious to work out on paper as you can see but...it does work ~Chara
