Elapsed Time Using Benchmarks.

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Presentation transcript:

Elapsed Time Using Benchmarks

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

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 4:00 4:30 4:45 30 + 30 + 15 = 75 minutes = 1 hour 15 minutes

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)?

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 4:00 8:00 8:15 4 hours + 20 min. + 15 min.= 4 hours 35 minutes

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

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. 2:00 2:45 10:30 11:00 12:00 noon 1 hr. + 2 hr. + 30 min. + 45 min. = 3 hr. 75 min. = 4 hr. 15 min.

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

Finding the ending time – Student 1 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. +5 min +4 hr. +25 min 11:00 11:25 6:55 7:00 The time is 11:25, which is 4 hrs. and 30 min. after 6:55.

Finding the ending time – Student 2 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 6:55 7:55 8:55 9:55 10:55 The time is 11:25, which is 4 hrs. and 30 min. after 6:55.

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?

Finding the start time The start time is 5:07. 5:07 5:17 8:17 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. 5:07 5:17 8:17 The start time is 5:07.

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?

Finding the start time I have to wake up at 6:30 AM. 6:30 6:45 7:00 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. 6:30 6:45 7:00 7:15 8:15 I have to wake up at 6:30 AM.