This question during a math class is wrong:
10 - 2 x 2 + 6
The only answer accepted as
Good is
0, which is wrong.
The order of operation precedence in arithmetic algebra is defined by the acronym PEMDAS:
- Parenthesis
- Exponent
- Multiplication and Division (left to right)
- Additioin and Subtraction (left to right)
This means the given expression is solved as follows:
- 10 - (2 x 2) + 6
- (10 - 4) + 6
- (6 + 6)
- 12
The only way you can get an answer of
0 is to evaluate step 2 in right-to-left order:
... which violates the order of precedence.
And, yes, he is a terrible math teacher. However, that would be terrible writing so ... let's just not go there.