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30 Second Challenge: The Fun Way to Learn Mathematics

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Visit this site: http://www.30secondchallenge.com/
Author:Norman D. Lock
Description: e-Books (PDF format) that provide an entertaining approach to developing mental arithmetic skills.
Levels: Elementary, Middle School (6-8), High School (9-12)
Languages: English
Resource Types: Problems/Puzzles, Educational Vendors, Books
Math Topics: Basic Operations, Fractions/Decimals/Percents

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