Question: I was just surfing a social site and found this question posted by someone. People were arguing or different answers like 80, 100, 120. So, what is the correct answer for $10 \times 10-10+10$?

I used order of operations (BODMAS) and got that the answer is 100. 
Am I right?

Answer: 
The usual convention is to give addition and subtraction *equal precedence*, evaluating them *from left to right*. So we start with multiplication ($10 \cdot 10$), then do the addition and subtraction from left to right to get $(100 - 10) + 10 = 100$.

If we were to take the acronym PEMDAS (BODMAS, BIDMAS, etc.) literally, it would seem that addition should be evaluated *before* subtraction. In this case we would get $10 \cdot 10 - 10 + 10 = (10 \cdot 10) - (10 + 10) = 80$. But this would not be correct; despite **A** being listed before **S** in the acronym, the intention is that they be given equal precedence and evaluated left to right.
$$
10 \cdot 10-10+10 = 100 - 10+10 = 90 +10 = 100. 
$$

Multiplication first, then addition and subtraction in the order they appear left to right is what you get by applying PEMDAS.