McGraw Hill Math Grade 3 Chapter 9 Lesson 3 Answer Key Problem Solving: Adding and Subtracting Time

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McGraw-Hill Math Grade 3 Answer Key Chapter 9 Lesson 3 Problem Solving: Adding and Subtracting Time

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Draw number lines to help solve the exercises.

Question 1.
Mr. Wagner lifts weights for 10 minutes and runs for 35 minutes. He finishes exercising at 6:15. When did he start exercising?
Answer:
Given,
Mr. Wagner lifts weights for 10 minutes and runs for 35 minutes.
10 + 35 = 45 minutes
He finishes exercising at 6:15.
6:15 can be written as 5 hours 75 minutes
Now subtract 45 minutes from the ending time to find the starting time of the exercise.
5 hour 75 minutes
-0 hour 45 minute
5 hour 30 minutes
Thus he starts exercising at 5:30

Question 2.
The train leaves at 7:15. Abby needs 15 minutes to get to the station, 20 minutes to pack, and 10 minutes to get ready. When should she start getting ready?
Answer:
Given,
The train leaves at 7:15.
Abby needs 15 minutes to get to the station, 20 minutes to pack, and 10 minutes to get ready.
15 + 20 + 10 = 45 minutes
Now subtract 45 minutes from the train leaving time to find when should she start getting ready.
7:15 – 45 minutes
7:15 = 6 hour 75 minutes
6 hour 75 minutes
-0 hour 45 minute
6 hours 30 minutes
Thus we should start getting ready by 6:30.

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