According to the PEMDAS rule, multiplication has precedence over division so the next order of operation is 2x12, which gives you 24.

And finally, 48/24 = results in 2.

"

This is where he gets it wrong. Sure, multiplication comes first in the acronym, but it doesn't properly relay the fact that multiplication

*and* division or addition

*and* subtraction are grouped and have the same priority.

PEMDAS, PEMDSA, PEDMAS, PEDMSA are all acronyms that would work to the the same effect. When all components of the equation share the same priority, you work your way left to right.

48 / 2 (12) -or- 48 / 2 * 12

= 24 (12) -or- 24 * 12

= 288