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Abacus in Various Number Systems

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Visit this site: http://www.cut-the-knot.org/Curriculum/Arithmetic/Abacus.shtml
Author:Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
Description: A Java simulation of the traditional abacus. Allows calculations in various number systems. The base ranges from 2 to 20. The tool inforces carry helping students grasp the idea of the positional, decimal in particular, number system.
Levels: Late Elem. (3-5), Middle School (6-8)
Languages: English
Resource Types: Simulations, Web Interactive/Java
Math Topics: Basic Operations, Number Sense/About Numbers

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