This site offers a variety of videos and interactive activities as well as printable exercises. Be sure to allow pop-ups (tools, turn off pop-up blocker).
Take the quiz to see how you do. These problems are not easy!
Remember that this is a challenge activity for this grade level!
This site has a variety of middle school math sites. Good graphics for practice.
This site has many teacher made videos that deomostrate a variety of middle and high school math concepts.
This site is wonderful for introducing or practicing middle school skills.
Use this site to find fun games which will help you with all types of math skills.
This site offers a variety of practice organized by skill.
This is a great place to practice these skills and see a visual of what you're doing. You need to scroll down to see the instructions.
Note that this skill is part of the Unit 1 challenge. See how changing variables affects a box and whisker plot.