Here are the solutions to the problems on the worksheet, broken down by section.
Section A: Use the time duration to fill in the end time
1) Start at 09:30. Add 20 minutes.
* $30 + 20 = 50$.
* The hour stays the same.
*
Answer: 09:50
2) Start at 09:30. Add 30 minutes.
* $30 + 30 = 60$ minutes.
* 60 minutes makes a full hour, so we move to the next hour (10:00).
*
Answer: 10:00
3) Start at 09:30. Add 1 hour.
* Just add 1 to the hour number: $9 + 1 = 10$.
* The minutes stay the same.
*
Answer: 10:30
4) Start at 08:05. Add 45 minutes.
* $5 + 45 = 50$.
* The hour stays the same.
*
Answer: 08:50
5) Start at 12:45. Add 15 minutes.
* First, get to the next hour: 12:45 to 1:00 is 15 minutes.
* Since we added exactly 15 minutes, we land right on the next hour.
*
Answer: 01:00
6) End at 03:00. Duration is 20 minutes. We need to find the start time (go backward).
* Subtract 20 minutes from 03:00.
* $00 - 20$ means we go back into the previous hour (02:something).
* $60 - 20 = 40$.
*
Answer: 02:40
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Section B: Find the duration between the times
1) From 11:25 to 12:00.
* Count up from 25 to 60 (which is the top of the hour).
* $60 - 25 = 35$.
*
Answer: 35 minutes
2) From 10:05 to 10:57.
* The hour is the same. Subtract the minutes: $57 - 5 = 52$.
*
Answer: 52 minutes
3) From 07:16 to 07:42.
* The hour is the same. Subtract the minutes: $42 - 16$.
* $42 - 10 = 32$, and $32 - 6 = 26$.
*
Answer: 26 minutes
4) From 08:00 to 03:00.
* This crosses over 12 o'clock.
* 08:00 to 12:00 is 4 hours.
* 12:00 to 03:00 is 3 hours.
* $4 + 3 = 7$.
*
Answer: 7 hours
5) From 09:22 to 05:22.
* Notice the minutes are exactly the same (:22). We just count the hours.
* 09:22 to 12:22 is 3 hours.
* 12:22 to 05:22 is 5 hours.
* $3 + 5 = 8$.
*
Answer: 8 hours
6) From 10:30 to 04:30.
* Minutes are the same (:30). Just count the hours.
* 10:30 to 12:30 is 2 hours.
* 12:30 to 04:30 is 4 hours.
* $2 + 4 = 6$.
*
Answer: 6 hours
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Section C: Fill in the duration of time in the boxes
1)
*
First part: 05:50 to 06:00. ($60 - 50 = 10$).
10 minutes.
*
Second part: 06:00 to 07:00.
1 hour.
*
Total Time: 1 hour 10 minutes.
2)
*
First part: 11:00 to 01:00. (11 to 12 is 1 hr, 12 to 1 is 1 hr).
2 hours.
*
Second part: 01:00 to 01:42.
42 minutes.
*
Total Time: 2 hours 42 minutes.
3)
*
First part: 10:35 to 11:00. ($60 - 35 = 25$).
25 minutes.
*
Second part: 11:00 to 02:00. (11 to 12 is 1 hr, 12 to 2 is 2 hrs).
3 hours.
*
Total Time: 3 hours 25 minutes.
4)
*
First part: 09:45 to 10:00. ($60 - 45 = 15$).
15 minutes.
*
Second part: 10:00 to 10:20.
20 minutes.
*
Total Time: Add the minutes together ($15 + 20 = 35$).
35 minutes.
Final Answer:
Section A
1) 09:50
2) 10:00
3) 10:30
4) 08:50
5) 01:00
6) 02:40
Section B
1) 35 minutes
2) 52 minutes
3) 26 minutes
4) 7 hours
5) 8 hours
6) 6 hours
Section C
1) Boxes: 10 minutes, 1 hour | Total: 1 hour 10 minutes
2) Boxes: 2 hours, 42 minutes | Total: 2 hours 42 minutes
3) Boxes: 25 minutes, 3 hours | Total: 3 hours 25 minutes
4) Boxes: 15 minutes, 20 minutes | Total: 35 minutes
Parent Tip: Review the logic above to help your child master the concept of time worksheet duration.
