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Multiplying Integers: Same and Different Signs

Learn how to multiply integers with same and different signs. Solve problems and explore real-life examples. Complete the assignment at the end of the lesson.

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Multiplying Integers: Same and Different Signs

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  1. Transparency 4 Click the mouse button or press the Space Bar to display the answers.

  2. Splash Screen

  3. Example 4-5b Objective Multiply Integers

  4. Example 4-5b Vocabulary None

  5. Example 4-5b Multiply Integers 2. Different Signs • Same Sign Negative Answer Positive Answer 3  -4 = -12 -3  4 = -12 3  4 = 12 -3  -4 = 12

  6. Lesson 4 Contents Example 1Multiply Integers with Different Signs Example 2Multiply Integers with Different Signs Example 3Multiply Integers with Same Signs Example 4Multiply Integers with Same Sings Example 5Use Integers to Solve a Problem

  7. Example 4-1a Find 9  (-6) Write problem Draw arrows to signs 9  ( - 6 ) Identify signs Opposite Signs Multiply numbers without signs 9  6 - Answer: 54 Opposite signs , negative answer 1/5

  8. Example 4-1b Find 4  (-7) Answer: –28 1/5

  9. Example 4-2a Find - 5  7 Write problem Draw arrows to signs - 5  7 Identify signs Opposite Signs Multiply numbers without signs 5  7 Opposite signs , negative answer - Answer: 35 2/5

  10. Example 4-2b Find - 8  3 Answer: –24 2/5

  11. Example 4-3a Find 7  9 Write problem Draw arrows to signs 7  9 Identify signs Same Signs Multiply numbers without signs 7  9 Same signs, positive answer + 63 Answer: 3/5

  12. Example 4-3b Find 5  4 Answer: 20 3/5

  13. Example 4-4a Find - 4  (- 8) Write problem Draw arrows to signs - 4  ( - 8 ) Identify signs Same Signs Multiply numbers without signs 4  8 Same signs, positive answer Answer: + 32 4/5

  14. Example 4-4b Find - 2  (- 7) Answer: 14 4/5

  15. Example 4-5a ELEVATORS An elevator takes passengers from the ground floor of a mall down to the underground parking garage. If it travels at a rate of 5 feet per second, where will it be in relation to the ground floor after 2 seconds? Determine process to use - 5  2 “Rate” refers to distance multiplied by time Identify distance Elevator is going down so number is negative Identify time 5/5

  16. Example 4-5a Draw arrows to signs - 5  2 Identify signs Opposite Signs Multiply numbers without signs 5  2 Opposite signs , negative answer - 10 feet Answer: Add dimensional analysis If it travels at a rate of 5 feet per second, Distance is in feet 5/5

  17. Example 4-5b * INVESTMENTS Mr. Green has invested in a stock whose price is decreasing at a rate of $3 per day. What will be the change in the price of the stock after 5 days? Answer: – $15 5/5

  18. End of Lesson 4 Assignment

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