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# Day 5 multiplying and dividing integers

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### Day 5 multiplying and dividing integers

1. 1. AIM: Multiplying and Dividing Integers Do Now Evaluate the following expression. a.) -3 - 5 + (-4) - (-2) 1
2. 2. Multiplication Repeated Addition Sum 3 (-5) -5 + ( -5 ) + ( -5) - 15 2
3. 3. Multiplication Repeated Addition Sum 3 (-5) -5 + ( -5 ) + ( -5) - 15 5 (-4) 2 (-8) 4 (-10) 3
4. 4. Multiplication Repeated Addition Sum 3 (-5) -5 + ( -5 ) + ( -5) - 15 2. What do you notice about the signs of the sums? 3. What do these examples suggest about the product of a positive and a negative integer? 4
5. 5. Think-Pair-Share Activity: Multiply 4.) -5 2 5.) -4 7 6.) 9 (-8) 5
6. 6. Use the pattern to find each product. 2(-5) = 1(-5) = 0(-5) = -1(-5) = -2(-5) = ­10 ­9 ­8 ­7 ­6 ­5 ­4 ­3 ­2 ­1 0 1 2 3 4 5 6 7 8 9 10 What conclusion about a negative number multiplied by a negative number based on this pattern? 6
7. 7. Multiply. 9.) -5 (-5) 10.) -3 (-4) 11.) -3 4 (-5) 12.) -8 (-6) (-2) 7
8. 8. 13.) Based on what we have explored with multiplying integers, what predictions can you make about dividing integers? Divide 14.) -500 ÷ (-10) 15.) 48 ÷ (-6) 8
9. 9. Evaluate the following expressions for: a = -3, b = 5, and c = -8 1.) -3c + b 2.) 5a - b c.) ab + c 9
10. 10. 16.) -5 • 4 + (-40) ÷ (-10) 17.) -3[(6 - 10) ÷ (-2)] 10
11. 11. Extra Practice 11
12. 12. BEFORE YOU LEAVE (Part 1) 18.) Find the mean of the differences in the values of a Canadian dollar and a US dollar for 1994 - 1998. The differences were -27 cents, -27 cents, -26 cents, -28 cents, -32 cents. 12
13. 13. BEFORE YOU LEAVE (Part 2) 19.) Find the mean of 4, -3, -5, 2, -8. 13
14. 14. Homework Castle Homework #2 due tomorrow 14
15. 15. AIM: Multiplying and Dividing Integers 15