Imagine we want to compute the square root of a number n. The basic idea of Heron’s method, named after the mathematician and engineer, Heron of Alexandria, is to find a number g that is close to ​ and to then average that with the number n/g, which corrects for the fact that g either over- or underestimates ​.

Estimating Square Roots in Your Head
from Gregory Gundersen favicon