MathCounts is a competition for middle school students. Northern takes a team to Penn State Harrisburg each year to compete. Check out the MathCounts website for the Problem of the Week and other challenging problems, student-created math videos, etc. For more information about Northern's MathCounts team, see Mr. Eisenhart.

Art of Problem Solving offers challenging online courses and curricula as well as an opportunity to interact with top-notch math students from all over the country. Also see the great videos in the Resources section.

A list of fun math links for the mathematically curious on the Hoagies Gifted Education website.

Problems of the Week for various levels and Ask Dr. Math, a website where math experts provide answers to a variety of perplexing questions.

I used ALEKS courses with my own children to preview math course content during the summer. It adapts content based on whether the students are correctly answering the questions.