1 / 23

Elapsed Time

Elapsed Time. Open Number Line. Open Number Line. Strategies for Addition. Addition – Can someone explain what is happening here?. 36 + 24. +4. +10. +10. 36. 60. 46. 56. 36 + 24 = 60. Addition – Can someone explain what is happening here?. 36 + 24. +10. +10. +4. 36. 60. 40.

norbertj
Download Presentation

Elapsed Time

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Elapsed Time Open Number Line

  2. Open Number Line Strategies for Addition

  3. Addition – Can someone explain what is happening here? • 36 + 24 +4 +10 +10 36 60 46 56 36 + 24 = 60

  4. Addition – Can someone explain what is happening here? • 36 + 24 +10 +10 +4 36 60 40 50 36 + 24 = 60

  5. Addition – Can someone explain what is happening here? • 36 + 24 +20 +4 36 60 56 36 + 24 = 60

  6. Open Number Line Strategies for Subtraction

  7. Subtraction – Can someone explain what is happening here? • 53 - 37 Strategy: count up from the smallest number +3 +3 +10 10 + 3 + 3 = 16 37 53 47 50 53 - 37 = 16

  8. Subtraction – Can someone explain what is happening here? • 53 - 37 Strategy: count back from the largest number -3 -10 -3 3 + 3 + 10 = 16 37 53 40 43 53 - 37 = 16

  9. Subtraction – Student 3 • 53 - 37 Strategy: count back from the largest number -3 -10 -10 -4 -10 16 53 20 33 43 23 53 - 37 = 16

  10. Elapsed Time Using Benchmarks

  11. How long is the movie? • I started watching a movie at 3:30 pm and it ended at 4:45 pm.

  12. Elapsed Time • The movie started at 3:30 and ended at 4:45. How long was the movie? +30 min +30 min +15 min Strategy: Start at 3:30 and add time increments to the hour or ½ hour, (benchmarks), then continue until end time. 3:30 4:45 4:00 4:30 30 + 30 + 15 = 75 minutes = 1 hour 15 minutes

  13. How much time is there between school and bedtime? • How much time is there between the time school is out (3:40 pm) and bedtime (8:15 pm)?

  14. Elapsed Time – using benchmarks • How much time is there between 3:40 and 8:15? Strategy: Start at 3:40 and add time increments to the ½ hour benchmarks, then continue increments. +20 min +4 hours +15 min 3:40 8:15 4:00 8:00 4 hours + 20 min. + 15 min.= 4 hours 35 minutes

  15. Time over the 12:00 hour • How much time is there between 10:30 am and 2:45 pm?

  16. Elapsed Time – over 12 o’clock hour • How much time is there between 10:30 am and 2:45 pm? +30 min. +1 hour +2 hours +45 min Strategy: Add increments to 12:00, then continue benchmark increments. 2:45 2:00 11:00 12:00 noon 10:30 1 hr. + 2 hr. + 30 min. + 45 min. = 3 hr. 75 min. = 4 hr. 15 min.

  17. Find the ending time • What time is 4 hours and 30 minutes from 6:55?

  18. Finding the ending time – • What time is it 4 hours and 30 minutes from 6:55? Strategy: Add minute increments to the ½ hour benchmark, then hours, then minutes. +4 hr. +5 min +25 min 11:00 11:25 7:00 6:55 The time is11:25, which is 4 hrs. and 30 min. after 6:55.

  19. Finding the ending time – • What time is it 4 hours and 30 minutes from 6:55? Strategy: Add hour increments until close, then minutes to the ½ hour, then minutes. +1 hr. +1 hr. +1 hr. +1 hr. +5 min +25min 11:00 11:25 7:55 8:55 10:55 6:55 9:55 The time is11:25, which is 4 hrs. and 30 min. after 6:55.

  20. Find the start time • What time did we start on our trip if we arrived at 8:17 and it took 3 hours and 10 minutes?

  21. Finding the start time • What time did we start on our trip if we arrived at 8:17 and it took 3 hours and 10 minutes? -10 min. -3 hr. Strategy: Subtract the hours then minutes. 8:17 5:07 5:17 The start time is 5:07.

  22. Find the start time • What time do I need to wake up if I have to be at school at 8:15 am and it takes me 1 hour and 45 minutes to get ready?

  23. Finding the start time • What time do I need to wake up if I have to be at school at 8:15 am and it takes me 1 hour and 45 minutes to get ready? -1 hr. -15 min. -15 min. -15 min. Strategy: Subtract the hour, then minute benchmarks. 8:15 6:30 6:45 7:00 7:15 I have to wake up at 6:30 AM.

More Related