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Order of Operations
The order of operations is a very simple concept, but is vital to correctly doing math. It is simply the order in which you should perform certain operations (like addition) to get the right answer. Take this equation:
If you were to simply solve from left to right, the answer would be incorrect. Let's do that now. 14 + 6 = 20. Divide that by 5 to get 4. Multiply 4 times 11 to get 44. Subtract 7 to get 37, and divide by 3 to get 12.333. (THIS IS WRONG!)
The order of operations will allow you to solve this problem the right way. The order is this: Parenthesis, Exponents, Multiplication and Division, Addition and Subtraction. Always perform the operations inside a parenthesis first, then do exponents. After that, do all the multiplication and division from left to right, and lastly do all the addition and subtraction from left to right.
A popular way of remembering the order is by putting together the first letter of each word: PEMDAS. You can also create a little phrase to go along with this, like "Please Excuse My Dear Aunt Sally." Whatever you choose, make sure that you know all six steps of the order of operations very well.
Let's try solving that equation again, this time using PEMDAS.
Step 1) Parenthesis. There aren't any. Move on.
Step 2) Exponents. None. Keep going.
Step 3) Multiplication and Division. Go from left to right, so divide 6 by 5 to get 1.2, and multiply that by 11 to get 13.2. Don't forget to divide 7 by 3 to get 7/3 (about 2.33).
Step 4) Addition and Subtraction. From left to right, 14 + 13.2 = 27.2, subtract 7/3 and get your answer: about 24.867.
The whole idea is just to follow the rule: PEMDAS. Now we can try to solve one with parenthesis and exponents on the next page.
What if you are given an equation like the one below? Just simplify it in small steps, using the order of operations at all times.
Remember, the first step is Parenthesis. Look inside the parenthesis, where we have 6 x 2. That comes out to 12. We can then square 12 to get 144, making this equation easy to finsh.
By now you should have a basic understanding of the order of operations. To continue learning more about this subject, you can keep browsing our site, or try a web search on Yahoo or Google. MathGoodies.com also offers a great lesson on the Order of Operations.