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I find it interesting that one would use this as a gauge because there are so many "tricks" one can use to do simple calculations without having to put the mathematics in the "brain register". This book for example goes through many mental tricks to quickly do calculations without the aid of calculators. Because you have personal experience with this, I assume that you have at least anecdotal evidence that you are correct, so can you give me an example of a calculation that you might consider a good "test"?