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|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)|
|Resource Types:||Web Interactive/Java|
|Math Topics:||Number Sense/About Numbers, Number Theory|
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