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### Grade 3 - Mathematics7.5 Elapsed Time

 Method: 4:30 is also read as half past 4. (because 30 minutes makes half an hour) 4:15 is also read as quarter past 4. (because 15 minutes makes quarter hour) 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: 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.1:452:301:402:00 Q 2: 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?6:005:155:455:00 Q 3: Mike played basketball for 3 and 1/2 hours. He started at 6. When did he finish?10:008:309:307:00 Q 4: Mark started on his Math homework at 4 and finished at 4:20. How long did he take to finish his homework?four hoursthirty minutesfour minutestwenty minutes Q 5: I started jogging at 6 o'clock. I finished at 6:45. How long did I jogged.1 hour30 minutes1 hour and 10 minutes45 minutes 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 hourseleven and a half hoursten hourseleven hours Q 7: Mr. Jones walks to work every morning. It takes him twenty minutes to get to work. He must be to work by 9. When should he start?8:45 am8:30 am8:40 am8:35 am Q 8: The concert started at 8 and finished at 10:30. How long did the concert last?2 hours2hrs. and 30 minutes3 hours3 hr. and 30 minutes Question 9: This question is available to subscribers only! Question 10: This question is available to subscribers only!

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