Tech Math 1

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Tech Math 1

• Day 1 1.2 Order of Operations

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Warm-Up Whats your sign?

• Chinese astrology
• predicts a persons personality based on the year
  of their birth
• Directions Read the animal descriptions and
  answer the questions on the attached sheet.

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1.2 Order of Operations

• Students will be able to
• Evaluate numeric expressions given more than one
  operator
• Operators

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Get Rid of Aunt Sally

• Why cant I use Please Excuse My Dear Aunt Sally?
  
• 1. Parenthesis
• 2. Exponents
• 3. Multiplication AND Division (L to R)
• 4. Addition AND Subtraction (L to R)

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P then E then MD then AS

• Work the inside parenthesis first.
• Multiply before subtracting.

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E before MD before AS

• Exponents are done before multiplication and
  division.

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Which one is correct?
Left
Right
The one on the left is correct.
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Multiplication and Division

• Multiplication and division are always done left
  to right.
• Remember multiplication is commutative and
  associative, but division is not.
• You can do problems that only contain
  multiplication in any order, but if division is
  in the problem, then the order is important.

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Addition and Subtraction

• Addition and subtraction work from left to right.
  
• Subtraction isnt commutative.
• Remember to think add the opposite when
  subtracting, but do it left to right.

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MD before AS

• Multiplication and division are always done
  before addition and subtraction.
• Write each step out completely under the previous
  step.

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Examples

• Ex.2 Student Practice (S.P.)
• (32)6 12 4
• (5)6 12 4
• 30 12 4
• 30 3
• 27

• Ex.1 Evaluate
• 2 5(76) 15 3
• 2 5(13) 15 3
• 2 65 15 3
• 2 65 5
• 67 5
• 62

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Examples

• Ex.4 Student Practice (S.P.)
• 3(11)³ 14 2
• 3(2)³ 14 2
• 3(8) 14 2
• 24 7
• 17

• Ex.3 Evaluate
• 2 5(31)² 10 2
• 2 5(4)² 10 2
• 2 5(16) 10 2
• 2 80 5
• 82 5
• 77

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Questions?
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Work Time

• Assignment
• pgs. 12 13 1-36 even