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All aboard!

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The Order of Operations Train!

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**Order of Operations: What does it mean?**

Break it down into parts: Order Operations of Who goes first in line? -

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**Who goes first? Do I multiply or subtract first? Why does it matter?**

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?

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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!

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**Just remember to excuse this lady:**

Who goes first? Just remember to excuse this lady: Aunt Sally!

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**To remember which order to do each operation:**

S Please Excuse My Dear Aunt Sally!

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**P M D A S Parentheses Multiply or Divide Add or Subtract**

exponents M D Multiply or Divide A S Add or Subtract ….and one more thing.

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**YOU MUST ALWAYS SOLVE FROM LEFT TO RIGHT!(EVERY TIME!)**

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**Let’s try a few examples:**

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… x 4 72 ÷ 3 – 10 20 x (10 – 7)

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More practice time……

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Section 1.3 Order of Operations. Evaluate 7 + 4 3. Is your answer 33 or 19? You can get 2 different answers depending on which operation you did first.

Section 1.3 Order of Operations. Evaluate 7 + 4 3. Is your answer 33 or 19? You can get 2 different answers depending on which operation you did first.

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