Mental Square Roots
Explore!
Explore!
A cool trick for mental square roots.
A cool trick for mental square roots.
Let n = a² + b,
Let n = a² + b,
then, sqrt(n) ≈ a + b/(2a)
then, sqrt(n) ≈ a + b/(2a)
Use the applet below to visualise how the trick works.
Use the applet below to visualise how the trick works.