Hi! I'm Dane Carlson, and welcome to the Business Opportunities Weblog. I've been publishing this website, by myself, and sometimes with the help of others for over twelve years now. You'll notice two things about this site right away:

  • We have tons of content. In fact, since November 2011, I've published more than 26,000 posts on thousands of different business ideas and opportunities.
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Qamacalc

This calculator might have a future in our underperforming schools:

From the moment pupils start using calculators they stop using their heads – for all quantitative work. The detrimental effect on maths education is well known.

Calculators, however, cannot be removed from classrooms anymore- they are indispensible because many results can only be received from calculators (e.g. root7, cosine70 etc.)

This serious problem, therefore, require an inventive solution:

A calculator into which one enters anything one would enter into normal (also scientific) calculators, but when the ‘=’ key is pressed nothing happens: The user must also enter a mental estimate, and if the calculator appraises the estimate as reasonable for the respective calculation – only then it shows the precise answer.

In classrooms where QAMA is the admissible calculator, students will no longer touch a calculator without using their heads too.

The name QAMA derives from Quick Approximate Mental Arithmetic, but QAMA also happens to be a word in Hebrew. It means: “How Much?”

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Originally posted by Dane Carlson on April 16, 2014 in Inventions.

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