Hi,
I am reminded of a lecture several years ago by Professor Harold Thimbleby of Swansea University http://www.harold.thimbleby.net/index.html where he showed how calculators can give incorrect answers, such as when trying to calculate 1+50% This can be an issue if the person has problems with maths and can't spot the errors. I have recreated the problem in this you tube video, please feel free to share as required. https://www.youtube.com/watch?v=iJTVbMX8QYs&feature=youtu.be
Regards
James Salisbury
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