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Splash Screen. Five-Minute Check (over Lesson 8–6) Main Idea and Vocabulary Key Concept: Units of Time Example 1: Add Units of Time Example 2: Subtract Units of Time Example 3: Subtract Units of Time to Solve a Problem Example 4: Elapsed Time. Lesson Menu.

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  1. Splash Screen

  2. Five-Minute Check (over Lesson 8–6) Main Idea and Vocabulary Key Concept: Units of Time Example 1: Add Units of Time Example 2: Subtract Units of Time Example 3: Subtract Units of Time to Solve a Problem Example 4: Elapsed Time Lesson Menu

  3. Add and subtract measures of time. • elapsed time Main Idea/Vocabulary

  4. KC 1

  5. Add Units of Time Find the sum of 3 h 15 min 52 s and 1 h 42 min 11 s. Estimate3 h 15 min 52 s + 1 h 42 min 11 s ≈3 h + 2 h or 5h Add seconds first, then minutes, and finally hours. 3 h 15 min 52 s + 1 h 42 min 11 s 63 seconds is greater than 60 seconds or 1 minute. 4 h 57 min 63 s Example 1

  6. Add Units of Time 4 h 57 min (1 min 3 s) Rename 63 seconds as 1 minute and 3 seconds. 4 h 58 min 3 s Add minutes. Answer: So, the sum is 4 hours 58 minutes 3 seconds.4h 58 min 3s ≈ 5h Example 1

  7. A B C D Find the sum of 2 h 18 min 37 s and 5 h 31 min 11 s. A. 7 h 30 min 8 s B. 7 h 48 min 49 s C. 7 h 49 min 48 s D. 8 h 8 min 29 s Example 1

  8. Subtract Units of Time Find the difference of 5 h 35 min 29 s and 2 h 51 min 10 s. Estimate5 h 35 min 29 s – 2 h 51 min 10 s ≈ 5.5 h – 3 h or 2.5 h 5 h 35 min 29 s – 2 h 51 min 10 s 19 s Subtract the seconds first. Notice that you cannot subtract 51 minutes from 35 minutes. (4 h 60 min) 35 min 29 s – 2 h 51 min 10 s 19 s Rename 5h as 4 h + 1 h or 4h 60 min. Example 2

  9. Subtract Units of Time 4 h 95 min 29 s – 2 h 51 min 10 s 19 s Add the minutes. 4 h95 min 29 s – 2 h 51 min 10 s 2 h 44 min 19 s Subtract the minutes, then the hours. Answer: 2h 44 min 19 s Check for Reasonableness 2 h 44 min 19 s ≈ 2.5 h  Example 2

  10. A B C D Find the difference of 7 h 16 min 45 s and 3 h 45 min 24 s. A. 3 h 29 min 21 s B. 3 h 31 min 21 s C. 4 h 29 min 21 s D. 4 h 31 min 21 s Example 2

  11. Subtract Units of Time to Solve a Problem MARATHONSThe table shows the times of the winners of the men’s and women’s races at the 2007 Boston Marathon. How much faster was Cheruiyot’s time than Grigoyeva’s time? Estimate 2 h 29 min 18 s – 2 h 14 min 13 s ≈29 min – 14 min or 15 min Example 3

  12. Subtract Units of Time to Solve a Problem 2 h 29 min 18 s Subtract the seconds first, then–2 h 14 min 13 s minutes, and finally hours. 15 min 5 s Answer: Cheruiyot’s time was 15 minutes 41 seconds faster than Grigoyeva’s time. Check for Reasonableness15 min 5 s ≈ 15 min  Example 3

  13. A B C D Jeremy ran a local marathon in 2 hours 53 minutes 47 seconds. His best friend Sam ran the same marathon in 2 hours 38 minutes 55 seconds. How much faster did Sam run? A. 14 min 8 s B. 14 min 52 s C. 15 min 8 s D. 15 min 52 s Example 3

  14. Elapsed Time MOVIESA movie begins at 2:45 P.M. and ends at 4:22 P.M. How long is the movie? You need to find out how much time has elapsed. 2:45 P.M. to 3:00 P.M. is 15 minutes. 3:00 P.M. to 4:22 P.M. is 1 hour 22 minutes. Example 4

  15. Elapsed Time Add the elapsed time before 3:00 and the elapsed time after 3:00 to find the total elapsed time. 15 min + 1 h 22 min 1 h 37 min Answer: The length of the movie is 1 hour 37 minutes. Example 4

  16. A B C D BUSES A bus leaves the station at 6:45 A.M. If it arrives at its destination at 8:10 A.M., how long was its trip? A. 1 h 25 min B. 1 h 35 min C. 2 h 5 min D. 2 h 35 min Example 4

  17. End of the Lesson End of the Lesson

  18. Five-Minute Check (over Lesson 8–6) Image Bank Math Tools Length in the Customary System The Metric System Resources

  19. A B C D (over Lesson 8-6) Complete. 20 m = _____ km A. 0.0002 B. 0.002 C. 0.02 D. 0.2 Five Minute Check 1

  20. A B C D (over Lesson 8-6) Complete. 100 L = _____ mL A. 1,000,000 B. 100,000 C. 10,000 D. 1,000 Five Minute Check 2

  21. A B C D (over Lesson 8-6) Complete. 45 mg = _____ g A. 4.5 B. 0.45 C. 0.045 D. 0.0045 Five Minute Check 3

  22. A B C D (over Lesson 8-6) Complete. 0.3 km = _____ m A. 30 B. 300 C. 3,000 D. 30,000 Five Minute Check 4

  23. A B C D (over Lesson 8-6) The nearest town is 4.5 kilometers away. How far is that in meters? A. 0.045 meters B. 0.45 meters C. 450 meters D. 4,500 meters Five Minute Check 5

  24. A B C D (over Lesson 8-6) A truck has a mass of 6,000 kilograms. How many grams does the truck weigh? A. 60,000 B. 600,000 C. 6,000,000 D. 60,000,000 Five Minute Check 6

  25. End of Custom Shows

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