Math Closet!
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Fuel the Brain - educational resources and games
Tiered assignments k-12 all subjects
Problem of the Month Problem of the Day More Problems of the Day The purpose of these sites is to provide teachers with a problem solving opportunity for their students that can be used on any schedule (daily/weekly/occasionally)
Over 700 websites created by students who participate in a ThinkQuest Competition.
Projects, Fun Sites and Field Trips for Middle School