Isn’t it frustrating when you are working frantically on your calculator on your iPhone, iPad or iPod and you mistype a digit? Then you have to start all the way over? Well, fret no more:
If you mistype a digit:
1) swipe your finger to the left or right at the top of the screen (where the number display is) and it will delete the last digit you typed.
2) Each subsequent swipe left or right will delete the next digit.
Voila! Make all the mistakes you need, you now have the power to undo!