http://www.c3.lanl.gov/mega-math

MEGA Mathematics, sponsored by the Los Alamos National Laboratory, suggests games and tutorials for elementary school students. The activities have intriguing names like “Untangling the Mathematics of Knots,” which uses knots to demonstrate math principles, and “Algorithms and Ice Cream for All,” which teaches problem-solving skills by addressing the question, “Where shall we build our ice cream stands so that no one has to travel too far?” Other activities include “Welcome to the Hotel Infinity” and “The Most Colorful Math of All.”