Punkt vor Strich
... German for => multiplication and division go before addition and subtraction
8+4*2
In maths, you usually do calculations from left to right. However, multiplications always go before additions (if there are no parentheses). So you first do 4*2 which is 8. You then add 8 and the other 8 to yield 16. Sixteen is the right answer.
Also see:
=> PEMDAS