Sixth and Seventh Grade:  

http://www.quia.com/cb/34887.html   

          Fraction/Decimal/Percent Jeopardy.  Play with a partner.  After you have completed a game, switch partners and try with someone else.  

Seventh Grade Challenge:    

http://www.quia.com/rr/42586.html  

          Try out this site to see if you can do the algebra.  If you do it and do well, show your final results to the substitute and I will give you credit.

Eighth Grade (or 7th grade challenge):

http://www.quia.com/cb/95591.html

          Jeopardy game.  Play with a partner.  If you are solving for x and the answer is, for example, 7, you must write your answer in the form of "x = 7" or the program will call your answer incorrect.