# Finding a cube root of a number without using calculator .

HI EVERYONE
I was thinking if we could find a cube root without using a calculator.
square root was easy to find without calculator,but cube root i have no idea to find it.
any help??
for example(cube root of 3 or 2)

finding a square root without using calculator.

Mark44
Mentor
Emmanuel_Euler
Svein
A numerical recipe for calculating $\sqrt[3]{a}$. Set $x_{1}=\frac{a}{3}$ and recursively calculate $x_{n+1}=\frac{1}{3}(2x_{n}+\frac{a}{x_{n}^{2}})$. Stop when |xn+1 - xn| is "small enough".