Tons of logic puzzles. I LOVE THIS SITE! http://www.puzzlersparadise.com
This is the site we looked at in class to read very large numbers. Have fun playing around with it! http://www.mathcats.com/explore/reallybignumbers.html
(Sample link) National Geographic for Kids http://www.nationalgeographic.com/kids/
Decimal and Whole Number Jeopardy http://www.quiz.com/cb/8142.html
Rags to Riches: Mean, Median, Mode, and Range Multiple Choice Game http://www.quia.com/rr/51667.html
Collection of decimal resources. http://classroom.jc-schools.net/basic/math-decim.html
A collection of decimal games. (Go to Interactive Games) http://www.decimalsquares.com