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Number World

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Visit this site: http://numberworld.info/

Author:David Geistert
Description: Key in any positive integer less than 10^15 and press the "Look up" button for properties about it: factorization, divisors, cross sum, equivalence in multiple bases, and more. Number World's math tools include an equation solver, an equation system solver, and a prime number checker. Also available in German.

Levels: Elementary, Middle School (6-8)
Languages: English, German
Resource Types: Web Interactive/Java
Math Topics: Number Sense/About Numbers, Number Theory

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