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The order of operations determines how to solve mathematical expressions correctly. This guide breaks down the rules into manageable parts using Aunt Sally's acronym, PEMDAS. Learn why the order matters and practice solving examples step by step!
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The Order of Operations Train!
Order of Operations: What does it mean? Break it down into parts: Order Operations of Who goes first in line? -
Soooooooooo……. • The order of operations is the order in which EACH operation is performed in an expression or equation! 5 x 13 – 10 Who goes first? Do I multiply or subtract first? Why does it matter?
Why??? • There is a certain order in which multiplication, division, addition, and subtraction must be performed when they are grouped together. • If you do not use the proper order, your answer will be incorrect!
Who goes first? Just remember to excuse this lady: Aunt Sally!
To remember which order to do each operation: M A P e D S Please Excuse My Dear Aunt Sally!
P Parentheses exponents M D Multiply or Divide A S Add or Subtract ….and one more thing.
To do this, get on the train and go in order from left to right following PeMDAS! • Let’s try a few examples: • Which operation would come first, second, etc… • 13 + 25 x 4 • 72 ÷ 3 – 10 • 20 x (10 – 7)
