The calculator that can save you one day of your life

It is annoying: Let’s say you are typing a longer calculation with multiple numbers into a classical calculator. At the end – of course – you recognize that there was a mistake at the beginning. So you have to do everything all over again. And then another number changes …*

That was my starting point. Why can’t we have something like a notepad, where, when you write your problems, the results appear on their own? You can see what you calculated and you can change every step at any time and get immediately the new result?

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