8 / 2 * (2 + 2)
Parentheses first so resolves to
8 / 2 * 4
Preliminary work done, now start over
Division and multiplication are of equal precedence so evaluate left to right
8 / 2 = 4
4 * 4 = 16


The key elements in human thinking are not numbers but labels of fuzzy sets. -- L. Zadeh

Which explains a lot.