I see a lot of teachers and students using iPhone’s Calculator tool in class.  Just like with any calculator, it is easy to hit the wrong number key.  Rather than clearing the entire calculation and starting over  [sigh!], there is a quick way to backup. To clear the last digit entered, simply swipe left or right on the calculation window. If you need to backup a few more spaces, swipe the number of digits you want to erase.


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