Government of Alberta
Learn Alberta: Math Interactives: Exploring Square Roots (Object Interactive)
Explore a set of perfect squares, as well as their square roots using this highly interactive math resource. In addition, students will get to look at estimates of the square roots of non-perfect squares. Printable activities, solutions,...
Braingle
Braingle: Math Brain Teasers
Check out the variety of math brain teasers at this site, which you can sort by popularity and difficulty.