Chapter 1: Sections 3&4 Evaluate Integers Ab Value
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Chapter 1: Sections 3&4 Evaluate Integers Ab Value

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Chapter 1, Section 3: Evaluating Integers, Section 4: Absolute value. Notes from September 2nd, 2009

Chapter 1, Section 3: Evaluating Integers, Section 4: Absolute value. Notes from September 2nd, 2009

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Chapter 1: Sections 3&4 Evaluate Integers Ab Value Chapter 1: Sections 3&4 Evaluate Integers Ab Value Presentation Transcript

  • Chapter 1 Section 3: Evaluating Expressions Section 4: Integers and Absolute Value By Ms. Dewey-Hoffman, 2009 http://msdhpowerpoints.blogspot.com/
  • Evaluating Variable Expressions
    • Evaluate a Variable Expression
      • Replace each variable with a number.
      • Use Order of Operations to Simplify.
    • Example Problems:
      • Evaluate 4 y – 15, y = 9
      • 4 (9) – 15  Replace variable with a number.
      • 4 (9) = 36  Order of Operations. Multiplication.
      • 36 – 15 = 21  Simplify. Subtraction.
  • Example Problems: Try These, Show Steps.
    • 6(g + h), for g = 9, h = 7
    • 2xy – z, for x = 4, y = 3, z = 1
    • r + s , for r = 13, s = 11
    • 2
  • Word Problems
    • Bottles of energy drinks come 24 bottles to a case.
    • How many cases does a store need to order if they want 120 energy drink bottles?
    • An online store that sells only gummies (worms and bears) and charges $0.75 for every pound that is ordered, plus a fee of $6.00 for shipping costs. Write an expression that relates the total price of an order in p pounds.
  • Integers
    • Integers
      • Whole numbers and their opposites. No decimals or fractions.
    • Opposites
      • The distance a number is from zero, but on the opposite side of zero.
      • Opposite of 7 is –7, opposite of –9 is 9.
      • There is no opposite of zero!
      • A negative sign means “opposite”.
      • Example Problems: Simplify
      • The opposite of –9
      • The opposite of positive 27
      • -(-6)
      • -(-(-7)
  • Absolute Value
    • Absolute Value
      • Is the measured distance a number is from zero.
      • The absolute value of 7 is 7.
      • The absolute value of –9 is 9.
      • DISTANCE IS ALWAYS POSITIVE.
    • Treat absolute value bars as grouping simples (or parentheses!).
      • Simplify inside the bars using Order of Operations.
  • Absolute Value Example Problems
      • |-3|
      • -|-3|
      • 4 - |-2|
      • The opposite of the absolute value of negative seven.
      • The opposite of the opposite of the absolute value of positive 8.
  • Assignment #2
    • Pages 15-16: 11-33 odd. Show steps.
    • Pages 19-20: 12-38 even. Show steps.
    • Extra Credit: Page 21: 56-59 all. Just answer, do not need to copy problem.
    • Remember!
    • Box answers.
    • Copy problems.
    • Show steps!
    • Due September 3 rd , 2009.