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Tool: Broken Calculator
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Go to: http://www.subtangent.com/maths/broken-calc.php (opens a new window)
Description: Eric's calculator has lost most of its keys. Can you find a way for the leftover keys to generate the target numbers?
Technology Type: Flash 
Author: Duncan Keith
Language: English 
Cost: Does not require payment for use

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  Gordon B
Comment:a good test. Especially good for those who have become too dependent on the current calculators out there.