I'm not even sure that they teach it in high school or college any more.
I work in a 4th grade classroom and we do this sort of problem all the time. The way we teach the kids:
48/2(9+3).....order of operations = PEMDAS or Please Excuse My Dear Aunt Sally...
1. parenthesis 9+3 = 12
2.multiplication and division are equal so you start at the left and work right......48/2 = 24
3. 24*12=288
That's how we teach our 4th graders.