When students see so many symbols on math problems, it can be overwhelming. Getting a grasp on number sense is first but then figuring out how they can be used to add, subtract, multiply and divide is a feat within itself. Now add parentheses and it may be just too much clutter for some.
So, how can we help students remember the order of operations? One strategy that has been around for a while is to remember PEMDAS. PEMDAS is an acronym for Parentheses, Exponents, Multiplication, Division, Addition and Subtraction (in that respective order). Students need to then be reminded to work left to right. Many people use the acronym Please Excuse My Dear Aunt Sally.
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Here's an example: 7 - 9 x 3 + 4=
If you start from left to right without PEMDAS you will find the answer to be 2.
With PEMDAS, you will find the answer to be -16.
Start with 9 x 3=27. Then, 7-27= -20 + 4=16.
The order of operations must be in place to find the correct answer.
Another example: 7 x (4+3) =
Start with 4+3 as it is in parentheses. Answer 7. Now, 7 x 7 = 49.
Without PEMDAS and working from left to right, you would get 31. A big difference!
Here's a fun video!
Try out these interactive games as well:
Order of Operations Millionaire Game
Fun Brain (various levels of difficulty available)
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