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Fast Arithmetic Tips

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Visit this site: http://www.cut-the-knot.org/arithmetic/rapid/
Author:Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
Description: Specific tips for three broad categories of rapid math: offensive (for the purpose of getting a result fast), defensive (for the purpose of discounting a result fast), or entertaining (for stunning your friends with math magic!). The entertaining category also contains a few demonstrative Java applets.
Levels: Middle School (6-8), High School (9-12)
Languages: English
Resource Types: Problems/Puzzles, Web Interactive/Java
Math Topics: Estimation

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