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The revolutionary calculator that shows the answer only when you also enter a suitable mental estimate. QAMA

With QAMA as the student's regular calculator and used exclusively, calculations can no longer be performed without involving the head and the proper comprehension of the ingredients. As expected, its effects on performance and, more importantly - understanding, are phenomenal.

It is even fun: Getting estimates accepted is satisfying. Understanding is pleasing. Users at all levels rapidly find themselves much better at it than they thought.

QAMA helps to, altogether, combat the reliance on useless rote performance that is so prevalent in math and science education.

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US Patent 6820800
 
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