Hours and Minutes
If a clock says 2:30, what number shows the hour?
2
To calculate elapsed time, we do (end time) _______ (start time)
Minus
If you start work at 7:00 AM and finish at 9:00 AM, how many hours did you work?
2 hours
If a clock says 8:39, what number shows the minutes?
39
What number do we add to PM times before we subtract?
12
If you start work at 8:00 AM and finish at 11:30 AM, how long did you work?
3 hours and 30 minutes
If Jack starts work at 9:00 AM, what number will be in the hours place one hour later?
10
If someone ends work at 12:15 PM, do we need to add 12?
No
If you start work at 10:00 AM and end at 3:00 PM, how many hours did you work?
5 hours
If Mary finishes work at 4:00, what number was in the hours place one hour earlier?
3
When we subtract times, do we subtract the hours and minutes together?
Subtract minutes first and then hours
If you start work at 11:15 AM and end at 2:45 PM, how long did you work?
3 hours 30 minutes
Robin starts work at 8:45 AM and finishes at 3:15 PM. What number will we write in the hours place if we want to calculate the number of hours they worked?
15 (because 3 + 12 = 15)
Explain in your own words how to calculate elapsed time.
Answers will vary
If you start work at 8:20 AM and end at 12:40 PM, how long did you work?