People struggle at basic mathematics because they don't need it for daily use in society. And you forget things when you don't use them.
You'll also find that most people do the same stuff they would have done without a calculator still without a calculator. The advantage now is when they do reach for the calculator they aren't working with perhaps 2 digits precision like the slide rule that preceded them or having to tabulate large amounts of figures to maintain precision.
You'll also find that most people do the same stuff they would have done without a calculator still without a calculator. The advantage now is when they do reach for the calculator they aren't working with perhaps 2 digits precision like the slide rule that preceded them or having to tabulate large amounts of figures to maintain precision.