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Mathletes Fab Five 1.(-14)(7) 2.12(-12) 3.(-8)(-5) 4.-9(-21) 5.18(-4) 6.(-10)(0) 7.11(-1) 8.-16(-5)

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Presentation on theme: "Mathletes Fab Five 1.(-14)(7) 2.12(-12) 3.(-8)(-5) 4.-9(-21) 5.18(-4) 6.(-10)(0) 7.11(-1) 8.-16(-5)"— Presentation transcript:

1 Mathletes Fab Five 1.(-14)(7) 2.12(-12) 3.(-8)(-5) 4.-9(-21) 5.18(-4) 6.(-10)(0) 7.11(-1) 8.-16(-5)

2 2.1 Multiplying Integers Day 2 Word Problems

3 Key Words That Indicate a Positive Integer Gain yards Deposit money Above sea level Increase temperature

4 Key Words that Indicate a Negative Integer Loses points Temperature declines Take out money or write check Stock went down Loses yards Below sea level

5 1.) You play a game where you score -6 points on the first turn and on each of the next three turns. What is your score after those 4 turns? How many points do you earn on each turn? -6 How many turns are there? 4 What operation will you use? Multiplication Set up your expression and simplify -6(4) = -24 points

6 2.) The outdoor temperature declines 3 degrees each hour for 5 hours. What is the change in temperature at the end of those 5 hours? How many degrees does the temperature decline each hour? -3 degrees For how many hours does it decline? 5 hours What operation will you use? Multiplication Set up and simplify the expression for the change in temperature -3 (5) =-15 degrees

7 2 step problems Do the multiplication problem and then look for the next step

8 3.) You have $200 in a savings account. Each week for 8 weeks, you take out $18 for spending money. How much money is in your account at the end of 8 weeks? How much money do you take out? -$18 For how long? 8 weeks Expression: (-18)(8) How much did you take out? $144 How much money is in your account at the end of 8 weeks? 200-144 $56

9 4.) A football team loses 4 yards on each of three plays. Then they complete a pass for 9 yards. What is the change in yardage after those four plays? How many yards does the football team loose on each play? -4 yards How many plays? 3 plays Expression: -4(3) -12 yards What happens on the fourth play? 9 yards Change in yardage after 4 plays -12 +9 -3 yards

10 5.) A submarine is at -125 feet in the ocean. The submarine makes three dives of 50 feet each. At what level is the submarine after the three dives? How many dives does the submarine make? 3 How many feet are each dive? -50 feet Write the expression 3(-50) -150 feet If the submarine was already at -125 feet what level is the submarine at after the 3 dives? -125 +(-150) -275 feet

11 Homework Page 41-42 (17-24) all


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