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Visit this site: http://www.mathrack.com/

Author:MathRack, Inc.
Description: "The original arithmetic rack," this manipulative resembles an abacus, but lacks place value columns. Also known as a Rekenrek, and originally developed by the Freudenthal Institute's Adrian Treffers.

Levels: Elementary
Languages: English
Resource Types: Educational Vendors
Math Topics: Basic Operations, Place Value, Patterns/Relationships

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