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Grade 3 - Mathematics
7.5 Elapsed Time

Method:

  1. 4:30 is also read as half past 4. (because 30 minutes makes half an hour)
  2. 4:15 is also read as quarter past 4. (because 15 minutes makes quarter hour)
  3. The elapsed time is the difference between two intervals of time.
Example: The show started at 2.20 pm and ended at 3.45 pm. How long did the show go on?
Start time = 2:20
End time = 3:45
Time elapsed = 3:45 - 2:20 (2:20 to 3:20 is 1 hour, 3:20 to 3:45 is 25 minutes)
1 hour 25 minutes
Answer: 1:25


Directions: Answer the following. Also write at least 10 examples of your own.
Q 1: Mr. Dan started cooking at 12. He finished cooking at 2:20. How long did he cook?
2:10
1:00
5:00
2:20

Q 2: Mark started on his Math homework at 4 and finished at 4:20. How long did he take to finish his homework?
twenty minutes
thirty minutes
four hours
four minutes

Q 3: Mom must leave the conditioner on her hair for 10 minutes. She put the conditioner on at 1:30. At what time should she wash off.
2:00
2:30
1:45
1:40

Q 4: The bell rings at 8. The class starts 25 minutes after the bell rings. When does the class start?
8:20
8:25
8:15
8:30

Q 5: The airport requests that all passengers report to the airport forty-five minutes before their flight. If Jennifer is taking a 6 o'clock flight. When should she arrive at the airport?
5:15
5:45
5:00
6:00

Q 6: Your uncle and aunt have come to visit for the day! They arrive at 9 o'clock. They went back at 7:30. How long did they stay?
ten and a half hours
ten hours
eleven hours
eleven and a half hours

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