📊Math G3 L7.6 🤔Explore B - Solving Elapsed Time Problems

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Part 1

(Voice explanation)

7.6 squirrel napping task.JPG

1.  What do you know?

  • He fell asleep for six and a half hours.
  • He woke up at 3:49.

2.  What can you do?

  • six and a half hours is six hours and 30 minutes
  • figure out the start time.

3.  What could be asked of you?

  • Find the time that Squirrel fell asleep.

Part 2

What is the start time?

  • We need to find this.

What is the elapsed time?

  • 6 hours and 30 minutes

What is the end time?

  • 3:49 pm

Let's use an open number line and a t-chart to solve this.

 

Voice Explanation

Mark the end time of 3:49 on the right side of the number line.  On the t-chart write 3:49 under the "Time" column.

 

7.6 t chart a.png7.6 number line a.jpg

 

Voice Explanation

Let's go back 3 hours--this will take us to 12:49.

 

7.6 t chart b.png7.6 number line b.jpg

 

Voice Explanation

We continue to mark off the time until all 6 hours and 30 minutes are moved.

 

7.6 number line and T chart examples.JPG

 

What is the start time?

  • Squirrel fell asleep at 9:19 a.m.

 

 

 

 

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