tosigreg

Suggestion to Improve Khan Academy Class Format ... and a New Class: Mastering Mental Math

Below are two quick thoughts for KA to consider. First. Khan Academy (KA) is fantastic ... and this is the reason. For those of us who never fully understood what was happening in math class from e...

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Slide Rule, how to use

Dear Khan Academy:  I understand that slide rules look like a strange tool from a prehistoric age ,,, somehow these little sticks of wood or plastic perform weird math alchemy.  But, to see an old-...

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