1. Agenda 10/18/11 1. Review Rules: Adding/Subtracting Integers 2. Discuss HW 3. Multiplying and Dividing Integers Practice
2. The Rules- Adding and Subtracting Subtracting Integers: Add the Opposite, then Follow the Rules of Addition Adding Different Signs: Subtract and Keep the sign of the Larger Number Adding Same Signs: Add and Keep the sign
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4. Step 2: If same signs, make the product positive.
5. Step 3: If different signs, make the product negative.(-2)(+5) = -10
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7. Step 2: If same signs, make the product positive.
8. Step 3: If different signs, make the product negative.(-2)(-5) = +10
10. Multiplying 3 or more signed numbers Example 4: What is (-6)(+2)(-4)? Rule: Step 1: Multiply. Step 2: If there are even negative signs, the final product is POSITIVE. Step 2: If there are an odd number of negative signs, the final product is NEGATIVE. 48
11. Rule Step 1: Multiply. Step 2: If same signs, make the product positive. Step 3: If different signs, make the product negative.
14. Word Problems 7. The Sunshine Daycare Center has been enrolling 3 new children every month. As a signed numbers problem, which expression below represents how many fewer children were in the school 6 months ago. (1) (+3)(+6)=+18 (2) (-3)(-6)= +18 (3) (+3)(-6)= -18
15. Word Problems 10. Calvin spent $20 a week on lottery tickets for 6 weeks. As a signed numbers problem, which of the following represents the amount that Calvin spent on lottery tickets? (1) (-6)(-$20)= $120 (2) (6)(-$20)= -$120 (3) (-6)($20)= -$120
