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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: Mr. Dan started cooking at 12. He finished cooking at 2:20. How long did he cook?2:101:005:002:20 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 minutesthirty minutesfour hoursfour 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.2:002:301:451:40 Q 4: The bell rings at 8. The class starts 25 minutes after the bell rings. When does the class start?8:208:258:158:30 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?5:155:455:006:00 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 hoursten hourseleven hourseleven and a half hours Question 7: This question is available to subscribers only! Question 8: This question is available to subscribers only!

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