iPhone app Qama Calculator

The revolutionary calculator that shows the answer only when you also enter a suitable mental estimate.
The required accuracy depends on the difficulty/ease of the calculation.

Ends the practice of calculating without thinking -

Provides the benefits of calculators without their damage.

The QAMA* calculator is already being used in many schools in several countries, demonstrating phenomenal effectiveness.
Getting an estimate accepted is also found to be very rewarding, rapidly building up the students confidence,

Covers the functions of scientific calculators.

* Quick Approximate Mental Arithmetic, QAMA- is also a word in Hebrew, meaning how much,

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