Order of Operations cont

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Order of Operations cont

• 1.4 cont

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Review!

• What is the saying that helps us remember the
  order of operations?

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ORDER OF OPERATIONS

• P E M D A S
• Please Excuse My Dear Aunt Sally!!

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• P Parenthesis
• E Exponents
• M Multiplication
• D Division
• A Addition
• S Subtraction

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Using the Left-to-Right Rule

• 12 7 3 6
• When an expression has a string of additions
  and subtractions or a string of multiplication
  and divisions, you need to perform the operations
  in order from left to right.
• 54 / 9 / 3

5 3 - 6
8 - 6
2
6 / 3
2
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Grouping symbols

• Grouping symbols indicate operations that should
  be performed first. The most common grouping
  symbols are parentheses ( ) and brackets . A
  fraction bar is also a grouping symbol.

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Grouping symbols

• Grouping symbols indicate operations that should
  be performed first. The most common grouping
  symbols are parentheses ( ) and brackets . A
  fraction bar is also a grouping symbol.

___
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Grouping symbols

• Evaluate 4(8-5)

4(3) subtract inside the parentheses.
12 multiply 4 and 3
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Another example write this down!
13 7

2 x 5
(13 7)
the fraction bar is a symbol to group the
numbers together
(2 x 5)
20
add 13 and 7. Multiply 2 and 5
10
2 divide
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? YOUR TURN!! ?
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• (4 1) x 3

2
5 x 3 add inside the parentheses
25 x 3 evlaute the power
75 multiply 25 and 3
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? YOUR TURN AGAIN! ?
2

• (3 7)(6 - 3)

2
(10)(3) evaluate inside the parenthesis
(10)(9) evaluate the power
90 multiply
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Using order of operations in real life!!

• Video games The tricks and
• point values for a skateboarding
• video game are shown. You
• complete one burntwist, three
• backflips, and four 360 flips. How many points
  did you score?

1 x 500 3 x 400 4 x 150
500 1200 600 multiply first
1700 600 add 500 and 1200
2300 add 1700 and 600
Answer You scored 2300 points
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THOUGHT OF THE DAY!!

• An ostrich's eye is bigger than its brain.