[aruanan]

48÷2(9+3) = ?

2? Because one starts inside the parentheses and works outward?

[Cyber Liberty]

Because one starts inside the parentheses and works outward?

Correctamundo. You picked a good example because it's my understanding a TI calculator will give you the incorrect answer because it (at least the earlier models) implements the parentheses incorrectly. I admit to the possibility it's my memory that is in error.