Order of operations tell us that we do multiplication and division first in the order we get to them, and then addition and subtraction after. 24/4*3-6/3+8. We'll divide 24 by 4 to get 6, but then we immediately have to multiply 6 times 3 to get 18. Then move down to 6 divided by 3 to get 2. So what we have now is 18 - 2 + 8 which is 24.
