http://gregtangmath.com/
This is both a free resource and a inexpensive resource. Greg has some features which are free. You can access the full website for $19.95. I buy a subscription for one class and use it on my projector. It works great with the Math in Focus math program. It also coincides with Common Core. Check it out and have fun!!
Greg also has some wonderful books (you have access to some of these with a subscription to the website).
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