Presentation Transcript
Slide 1:What Time
Is It?
Slide 2:What time is it? 10:25
Slide 3:What time is it? 7:45
Slide 4:What time is it? 5:30
Slide 5:What time is it? 3:55
Slide 6:What time is it? 1:30
Slide 7:What time is it? 9:15
Slide 8:What time is it? It is half past ten or 10:30 in the morning. It is a quarter past twelve or 12:15 in the afternoon. It is forty-five minutes after nine or quarter of ten in the evening.
Slide 9:It is 25 minutes past four or 4:25 in the afternoon. It is 55 minutes after seven or five of eight in the morning. It is 10 minutes past six or 6:10 in the evening. It is 28 minutes past two or 2:28 in the afternoon.
Slide 10:What time is it?
Slide 15:Elapsed Time Elapsed time is the amount of time that has passed.
Slide 16:It is 8:15 a.m. Sam will sleep 2 hours and 15 minutes longer. When will Sam wake up? To find this answer which operation do you need to use? + What word clues help you
know you need to add? "minutes longer"
Slide 17:First add the hours.
8:15 a.m. + 1 hour = 9:15 a.m.
9:15 a.m. + 1 hour = 10:15 a.m. Next, add the minutes.
10:15 a.m. + 15 minutes = 10:30 a.m.
Slide 18:Your Turn! It is 8:30 p.m. Myeshia will talk on the phone for 3 hours and 50 minutes longer. What time will she get off the phone?
Slide 19:What operation did you use and
how did you know to use
that operation? Addition, because of
the words "minutes longer".
Slide 20:What did you add first? The hours are added first.
8:30 p.m. + 1 hour = 9:30 p.m.
9:30 p.m. + 1 hour = 10:30 p.m.
10:30 p.m. + 1 hour = 11:30 p.m.
Slide 21:What did you add next? The minutes are added next.
Do you notice something
different about this problem? If you add 50 minutes to 11:30 p.m.
you will go past 12:00 a.m.
Slide 22:What should you have
done now? From 11:30 p.m. to 12:00 a.m. 30 minutes passed.
You still have 20 minutes left to find.
12:00 a.m. + 20 mintues = 12:20 a.m.
Slide 23:Why is your answer a.m.
instead of p.m.? At midnight the time
switches from p.m. to a.m.
Slide 24:Lets Try Another One! It is 11:15 p.m. Hansel ate 1 hour and 15 minutes ago. What time did he eat?
Slide 25:What operation did you use and
how did you know to use
that operation? Subtraction, because of
the words "minutes ago".
Slide 26:What did you subtract first? The hours are subtracted first.
11:15 p.m. - 1 hour = 10:15 p.m.
Slide 27:What did you subtract next? The minutes are subtracted next.
10:15 p.m. - 15 minutes = 10:00 p.m.
Slide 28:Lets Try Another One! It is 9:30 a.m. The three bears went for a walk 2 hours and 50 minutes ago. What time did they leave for their walk?
Slide 29:What operation did you use and
how did you know to use
that operation? Subtraction, because of
the words "minutes ago".
Slide 30:What did you subtract first? The hours are subtracted first.
9:30 a.m. - 1 hour = 8:30 a.m.
8:30 a.m. - 1 hour = 7:30 a.m.
Slide 31:What did you subtract next? The minutes are subtracted next.
Do you notice something
different about this problem? If you subtract 50 minutes from 7:30 a.m.
you will go before 7:00 a.m.
Slide 32:What should you have
done now? From 7:30 a.m. to 7:00 a.m. 30 minutes passed.
You still have 20 minutes left to find.
7:00 a.m. - 20 mintues = 6:40 a.m.
Slide 33:I Challenge You!
Slide 34:Sam runs 1 mile in 20 minutes. How much time would elapse if Sam ran 3 miles?
Slide 35:What operation did you use and
how did you know to use
that operation? Repeated addition or multiplication,
because I was finding out
how many miles altogether.
Slide 36:How did you solve the problem? Repeated Addition
20 + 20 + 20 = 60 minutes
60 minutes = 1 hour Multiplication
20 x 3 = 60 minutes
60 minutes = 1 hour