How many times have you evaluated a numerical expression, and even though you know your addition, subtraction, multiplication, and division is correct, you still have the wrong answer?
If this has happened to you, then you probably haven't used the Order of Operations correctly.
The order of operations is a set of rules that you must follow in order to correctly evaluate a numerical expression that contains multiple operations (a combination of addition, subtraction, multiplication, and division).
In order to remember this set of rules, many people remember the acronym, PEMDAS. Check it out:
Ok, now let's use this set of rules to evaluate numerical expressions.
One last example with a power to evaluate. Take a look....
The order of operations can easily be remembered by thinking of the acronym, PEMDAS: Parentheses, Exponents, Multiplication or Division and Addition or Subtraction.
If you perform the operations within a problem in this order, then you will be sure to arrive at the correct solution. However, if you do not perform the operations in this order, then you will most likely end up with an incorrect solution!
We will continue our study of the order of operations in our next lesson, as we focus on alternative grouping symbols.