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Simply so, which operation should be performed first?

First, consider expressions that include one or more of the arithmetic operations: addition, subtraction, multiplication, and division. The order of operations requires that all multiplication and division be performed first, going from left to right in the expression.

Also, when was the order of operations first used? In 1912, First Year Algebra by Webster Wells and Walter W. Hart has: "Indicated operations are to be performed in the following order: first, all multiplications and divisions in their order from left to right; then all additions and subtractions from left to right."

Then, what is the correct order of operations?

The "operations" are addition, subtraction, multiplication, division, exponentiation, and grouping; the "order" of these operations states which operations take precedence (are taken care of) before which other operations.

Do you always use order of operations?

If there are multiple operations at the same level on the order of operations, move from left to right. you work like this: First notice that, there are no Parentheses or Exponents, so we move to Multiplication and Division. Within a set of parentheses, the order of operations should be followed.