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Comments for QAMA Feedback - QAMA Feedback Quick Approximate Mental Arithmetic Tue, 01 Jan 2013 14:41:27 +0000 hourly 1 Comment on Welcome to QAMA Feedback by QAMA Tue, 01 Jan 2013 14:41:27 +0000 Thank you, Neil,

ha, this is about math education. But actually yes, about material benefit too, but much greater than a listing: The entire Economy benefiting from a more numerate and thinking school-output.

Is the school near you already using it?

Comment on Welcome to QAMA Feedback by Neil Palin Mon, 31 Dec 2012 18:31:16 +0000 Fantastic idea and achievement. Spent 20 years being a Maths teacher and would love for this to be the standard calculator for Maths teaching. Would love to buy shares in the company…. when are you going to be listed ?!

Comment on Welcome to QAMA Feedback by QAMA Sun, 30 Dec 2012 12:24:46 +0000 Thank you Graham.

When I observe children whirring around on their smart phones / tablets (and on my computers) I wonder whether it isn’t adults for whom the simpler device should be made…

Same with the display size: If adult drivers had to be tested on reading children’s mobile text messages – this would be the way to clear the roads of traffic.

Bringing about another version is an unenviable task. Regarding the more advanced functions, young students should be told: “There is nothing scary there, we simply haven’t yet gotten round to telling you what they mean”.

Comment on Welcome to QAMA Feedback by Graham Kneebone Parent Sat, 29 Dec 2012 22:24:22 +0000 Hi
Its a great idea, and we have two for our young children, how about a simpler version for younger children, say just learning maths (5, 6 years old) with say limited, maths functions for children just learning maths Add , divided multiply and divide, Plus maybe square root, and square numbers. If you intend to make a simpler one could it have larger display and key pads. more like,r:10,s:0,i:165 say Casho cs-912 ? I think simpler version of your calculator would be great for this ago group.

Graham Kneebone Parent

Comment on Welcome to QAMA Feedback by QAMA Wed, 21 Nov 2012 19:24:39 +0000 Thank you Daniel, your comment is of very particular relevance: see

CNN September 30, 1999: “Metric mishap caused loss of NASA orbiter
NASA lost a 125 million Mars orbiter because a Lockheed Martin engineering team used English units of measurement while the agency’s team used the more conventional metric system for a key spacecraft operation, according to a review finding released Thursday.”

“A failure to recognize and correct an error in a transfer of information between the Mars Climate Orbiter spacecraft team in Colorado and the mission navigation team in California led to the loss of the spacecraft last week, preliminary findings by NASA’s Jet Propulsion Laboratory internal peer review indicate.
“People sometimes make errors,” said Dr. Edward Weiler, NASA’s Associate Administrator for Space Science. “The problem here was not the error, it was the failure of NASA’s systems engineering, and the checks and balances in our processes to detect the error. That’s why we lost the spacecraft.”
The peer review preliminary findings indicate that one team used English units (e.g., inches, feet and pounds) while the other used metric units for a key spacecraft operation. This information was critical to the maneuvers required to place the spacecraft in the proper Mars orbit.”
A QAMA using aerospace engineer like yourself would, most likely, have prevented this happening.

Comment on Welcome to QAMA Feedback by Daniel Renner Wed, 21 Nov 2012 17:11:10 +0000 Hi,
I just bought the calculator because I really like the idea and to stress my brain a little bit while doing some daily math couldn’t be bad. I’m neither a student nor a teacher, I work as Quality Manager in the Aerospace business and I have to do a lot of unit conversion. I’m really amazed how good the training aspect is while using this calculator. My estimates are getting better and better and most of the stuff I have to calculate doesn’t require a calculator any more. Great job! What I’m missing a little bit is a percentage of how acurate my estimate was, sometimes, the tolerances of the calculator are more than fair ;)

Comment on Welcome to QAMA Feedback by QAMA Fri, 02 Nov 2012 07:46:51 +0000 What are the red lights for?
Well, as the days are getting shorter, the sun sets early, I thought to brighten up your nights…
Not really:
What you did to get the lights flashing was pressing [2nd] and then [EST] (the key above the ‘=’). This turns the QAMA calculator into an ordinary calculator, namely, the answer is shown without requiring a suitable estimate – the ‘lazy’ mode, as we call it. The reason I introduced this option was to save having to buy two calculators in case one wanted, only occasionally I hope, to get the answers without having to think. However, the problem was how to prevent doing so in the classroom: The lights are flashing to let the teacher know!
I did not want these lights to be too obtrusive, so the teacher might not see it in the back rows (where the naughty kids usually sit – that is where I used to live). The teacher would, however, see it when walking around the classroom. When the teacher approaches, the student would naturally rush to switch it back into the ‘legal’ EST mode, or just switch the calculator off. But when one does so- no use: the lights flash on! (They stop after approx. a minute after switching back to [2nd] EST of Off; If you just leave it in the EST mode and don’t do anything, it will switch off on its own after ~seven minutes.)
All this so you won’t have to buy two calculators…

Comment on Welcome to QAMA Feedback by Hallie Fri, 02 Nov 2012 02:08:50 +0000 What do the red lights do? I’m a student and my teacher let me try hers out for fun. I pressed some buttons and red lights started flashing and I couldn’t get them to stop.

Comment on Welcome to QAMA Feedback by Dave Fri, 19 Oct 2012 17:05:23 +0000 Great device. It arrived within two days of order, perfectly packaged. Wonderful product for my students. Thanks.

Comment on Welcome to QAMA Feedback by QAMA Wed, 17 Oct 2012 07:08:28 +0000 Thank you,
You might be even more shocked if you knew how much work the processor actually does – far outstripping the output of a solar cell: This is a very large and complex program due to the need of the acceptance tolerances to reflect the difficulty of the respective calculations – of which there are infinitely many.