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Splash Screen. Five-Minute Check (over Lesson 3–3) Main Idea Example 1: Problem-Solving Investigation: Work Backward. Lesson Menu. Solve problems using the work backward strategy. Main Idea/Vocabulary. Work Backward.

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  1. Splash Screen

  2. Five-Minute Check (over Lesson 3–3) Main Idea Example 1: Problem-Solving Investigation: Work Backward Lesson Menu

  3. Solve problems using the work backward strategy. Main Idea/Vocabulary

  4. Work Backward SHOPPINGLucy and Elena went to the mall. Each girl bought a CD for $16.50, a popcorn for $3.50, and a drink for $2.50. Altogether, they had $5.00 left over. How much money did they take to the mall? Understand You know that the girls have $5 left and the amounts they spent. You need to find the initial amount they had. Plan Start with the end result and work backward. Example 1

  5. Work Backward Solve They had $5 left. UNDO the 2 × $2.50 spent on drinks. 5 + 5 = 10 UNDO the 2 × $3.50 spent on popcorn. 10 + 7 = 17 UNDO the 2 × $16.50 spent on CDs. 17 + 33 = 50 Answer: So, Lucy and Elena initially had $50. Example 1

  6. Work Backward Check Assume that they started with $50. After buying CD’s, they had $50 – $33 or $17. Then they spent $7 on popcorn; $17 – $7 = $10. Then they spent $5 on drinks; $10 – $5 = $5. So, the answer is correct. Example 1

  7. A B C D AIRPORT Jackson will leave from work to go home before he heads to the airport. He needs to be at the airport at 1:15 P.M. It takes him 45 minutes to drive to the airport from home, 30 minutes to pack at home, and 20 minutes to drive back from work to home. What time should he leave work? A. 11:00 A.M. B. 11:20 A.M. C. 11:40 A.M. D. 12:00 P.M. Example 1

  8. End of the Lesson End of the Lesson

  9. Five-Minute Check (over Lesson 3–3) Image Bank Math Tools Solving Equations Using Models Perimeter Solving EquationsTwo-Step Equations Resources

  10. A B C D A.6 B.7 C. D. (over Lesson 3-3) Solve 7y = 42. Five Minute Check 1

  11. A B C D (over Lesson 3-3) Solve –8h = 64. A. 8 B. 7 C. –7 D. –8 Five Minute Check 2

  12. A B C D A.4 B.6 C. D. (over Lesson 3-3) Solve 24 = 6r. Five Minute Check 3

  13. A B C D (over Lesson 3-3) The product of a number and 5 is –45. Find the number. A. 9 B. 5 C. –5 D. –9 Five Minute Check 4

  14. A B C D (over Lesson 3-3) Lynwood earns $7 per hour working at the coffee shop. How many hours does he need to work to earn $105? A. 5 hours B. 15 hours C. 20 hours D. 25 hours Five Minute Check 5

  15. A B C D (over Lesson 3-3) Rita invited 16 friends to her birthday party. If she has 112 party favors, how many party favors can each of her friends receive? A. 4 B. 5 C. 7 D. 9 Five Minute Check 6

  16. End of Custom Shows

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