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

**Solve**

**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.