If you want to challenge yourself with some pre-algebra, try this!  https://docs.google.com/file/d/0B3UTxI53nx2pS0NQTEk3T3h3TEE/edit?usp=sharing

Go to the David Reese website (link is on the lower right side) and click on David Reese students click on here button.

Have a great time off!  If you would like to have fun with math, go to http://coolmath.com!