Adding Decimals
http://www.mathgametime.com/games/hungry-puppies-decimals
Add/Subtract/ decimals
http://www.math-play.com/Decimals-Jeopardy/decimals-jeopardy-game_html5.html
Integers, rational numbers comparing rational numbers
http://www.math-play.com/Comparing-Rational-Numbers/comparing-rational-numbers-jeopardy-game_html5.html