I'm not joking when I say I'm 30 and I still don't understand how to use a calculator without a proper display where you see the entire expression to be evaluat

I'm not joking when I say I'm 30 and I still don't understand how to use a calculator without a proper display where you see the entire expression to be evaluated. At school in the UK we all had calculators where entire expressions could be typed in including proper fractions and parentheses. I find the more basic kind of digital calculators, including built-in calculator apps, to have totally impenetrable user interfaces