University of Saskatchewan (Canada)
University of Saskatchewan: Square Roots & Other Radicals
This University of Saskatchewan site provides general information about square roots and other forms of radical equations.
Fun Brain
Fun Brain: Tic Tac Toe Squares
Players simplify square roots to win the tic tac toe learning game.
Other
Mathebook.net: Middle: Square Root
The online virtual self-checking resource has students practice calculating the square root of a number.