Multiplying integers web

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Multiplying integers web

  1. 1. MULTIPLYING INTEGERS
  2. 2. BELL RINGER • The absolute value of two numbers that are additive inverses will __?__ be the same. • a) always b) sometimes c) never • You earn $5 per hour at your job in a restaurant but pay for any food you eat. On Friday, you receive a check for 7 hours of work, minus $8.90 for food. What is the amount of your check?
  3. 3. BELL RINGER • The absolute value of two numbers that are additive inverses will __?__ be the same. • a) always b) sometimes c) never • You earn $5 per hour at your job in a restaurant but pay for any food you eat. On Friday, you receive a check for 7 hours of work, minus $8.90 for food. What is the amount of your check? • 7 x 5 = $35 • $35 - $8.90= $26.10
  4. 4. WHERE WE WERE… • Adding and Subtracting Integers • Properties of addition • Order of Operations • Distributive Property • Solving equations • “The opposite of…”
  5. 5. WHERE WE ARE… • Students will learn to… • Use a number line to show multiplication of integers. • Use Counter Chips to model multiplication of integers.
  6. 6. MODELING/NUMBER LINE ACTIVITY • Fold your paper in half length wise • Fold your paper in half width wise • Number the square 1-4 as shown • Write each problem in the top of the square • In each square, include the model and number line we create. • Counter Chips – yellow is positive, red is negative 1 4 2 3
  7. 7. #1 3(2) = 6 • 3(2) means three groups of 2 • Use the Counter Chips to model three groups of 2. • Use a number line to show three groups of 2
  8. 8. #2 3(-2) = -6 • 3(-2) means three groups of -2. • Use Counter Chips to model three groups of -2. • Use a number line to model three groups of -2.
  9. 9. #4 -3(-2) • -3(-2) means the opposite of three groups of -2 which changes to…. Three groups of 2 • Use the Counter Chips to model the opposite of three groups of -2. • Use a number line to show the opposite of three groups of -2.
  10. 10. RULES • Positive x Positive = Positive • Positive x Negative = Negative • Negative x Positive = Negative • Negative x Negative = Positive • When multiplying two numbers with the same sign, your answer is positive. If signs are different, your answer is negative.

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