Hit the safe
Hit the safe!

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The Safe can be opened by clicking on all numbers in outer ring that are a factor (divisor) of the number in the middle.

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Abstract	The Safe can be opened by clicking on all numbers in outer ring that are a factor (divisor) of the number in the middle.
Keywords	Vermenigvuldigen, Delen
Target group	Primair Onderwijs, Voortgezet Onderwijs
Date last modification	03-09-2013, ORG: Universiteit Utrecht, Freudenthal Instituut