The mental calculation of the square root of a number  
Square roots 
The mental calculation of the square root of a number.  
The square
root is the inverse of the square. We can obtain the square root of
a number by trying to find which number turns out to be the radicand when
it is multiplied by itself. 

Calculate
the whole square root of the number shown, type it in the control box
below and hit Enter. 

The radicand is a
natural number that is probably not a perfect square, so its square root
has a remainder. Find the whole square root by default, that is, you have to find a natural number whose square is closest to the radicand, but does not exceed it. 


The radicand is a natural number or a perfect square decimal number, that has got only one digit different from 0. Finding its square root is easy.
The square
root of a positive number has two real solutions and both solutions
the positive and the negative are correct. 
Take the
numbers below to the corresponding circle. 


Eduardo Barbero Corral  
Spanish Ministry of Education. Year 2007  
Except where otherwise noted, this work is licensed under a Creative Common License