Line Grapher - graph linear functions on the coordinate plane
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WEBSITES
Khan Academy - This site was featured on 60 Minutes. Browse through hundreds of math topics to find the tutorial you need. 15 minute lessons on nearly every math topic imaginable.
Sumdog - math games and contests
Monty Hall - probability experiment
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Coin Toss - probability experiment
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PRACTICE SITES
Hippocampus - lots of free videos on all sorts of topics
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SAT practice - free!! - practice problems for the SAT exam. Hit "Start Practicing"
every algebra topic....ever at ixl.com