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