Elementary Math: Difference between revisions
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[http://www.youtube.com/watch?v=XqlD6P3ogJc&NR=1 video of Multiplication on the Checkerboard] | [http://www.youtube.com/watch?v=XqlD6P3ogJc&NR=1 video of Multiplication on the Checkerboard]<br> | ||
[[Square of Pythagoras]] | |||
