Trachtenberg Speed System
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|An introduction to Trachtenberg's system of performing high-speed multiplication, division, addition, subtraction, and square root, all in one's head, with references.|
|Levels:||Elementary, Middle School (6-8), High School (9-12)|
|Resource Types:||Problems/Puzzles, Recreations|
|Math Topics:||Basic Operations, Exponents/Roots|
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