The Calculator application issue or glitch
Why doesn't the calculator app calculate correctly?
For example, 2+2*4=10, but if you do everything separately, you get 16!
and so on for each long example
iPhone XR
Your example was at best ambiguous.
i.e. Did you mean (2+2)*4 … or 2+(2*4) ?
Calc didn’t know what you meant either so it fell back to it’s defaults.
You might find this article informative in explaining the generally-accepted “default” behaviours.