Welcome: we are very interested in your comments. Kindly say whether you are a teacher, student or other. Thank you.
I am a Math consultant and will be showing your invention around schools from September. Great idea! A Tables mode would be great, where students can practice those basics that the calc assumes they know. Any plans for an iPhone App?
Thank you so much.
- QAMA can not be added to an iAnything that already has an ordinary calculator, because classroom students could switch over uncontrollably. Indeed, the QAMA calculator has a ‘non-thinking’ mode too, namely- working as an ordinary calculator, but when switched into this mode it flashes lights to warn the teacher. Even from his grave, we assume, Steve Jobs would not let us make his iAnything flash if switched out of our app…
We tried to set the price of the QAMA calculator low enough to justify a stand-alone.
Regarding a ‘Tables mode’: It is there already because such calculations have zero tolerance. For, say, 5×7, students would not see the 35 unless they got there on their own first. In fact, learning it this way is much better than being given a table and just memorizing it.
How refreshing to see a calculator that actually helps people improve their basic mathematical skills! Too often I see school systems allowing the use of calculators in the classroom for basic arithmetic problems. I hope this becomes a common tool is schools.
Hi. This is an absolutely outstanding idea. I also read in Forbes that it was a 14 – year labour of love to tweak the tolerance bands for the levels of difficulty. I am amazed at the passion for both Math and Education. I wish you all success!
Nary / B. ‘Nary’ Narayanaswamy / New Delhi / India
what a great idea…have often felt the need for this…
I really like your calculator. I bought one and was impressed at how well it worked.
However given that we are moving toward tablet-based computing it would seem much more reasonable to have it as a downloadable app or an online calculator.
I see that you used to have an online version. Is this still available?
Great idea. However, I am a little shocked it is not solar powered.
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.
Great device. It arrived within two days of order, perfectly packaged. Wonderful product for my students. Thanks.
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.
What are the red lights for?
Well, as the days are getting shorter, the sun sets early, I thought to brighten up your nights…
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…
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
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.
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 http://www.google.co.uk/imgres?q=calculator&hl=en&sa=X&biw=1487&bih=869&tbm=isch&prmd=imvnsa&tbnid=9Sd3knTOppRR7M:&imgrefurl=http://www.diytrade.com/china/pd/3532935/ELECTRONIC_CALCULATOR.html&docid=_iegcdhM-Rp-AM&imgurl=http://img.diytrade.com/cdimg/508128/4721876/0/1195525926/ELECTRONIC_CALCULATOR.jpg&w=796&h=1024&ei=5WzfUJj0OYnT0QXgp4GABw&zoom=1&iact=hc&vpx=508&vpy=310&dur=5&hovh=255&hovw=198&tx=97&ty=159&sig=110291561670188696965&page=1&tbnh=133&tbnw=100&start=0&ndsp=39&ved=1t:429,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
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”.
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 ?!
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?
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