📊Math G3 L7.3 🤔Explore C - Elapsed Time on a Number Line

Part 1

(Voice explanation)

What is the start time?

• 5:45

What is the elapsed time?

• We don't know.

What is the end time?

• 8:30

What is the elapsed time?

Let's use a number line.

Mark the start time and the end time.

Then do jumps to determine the space between.

(Voice explanation)

How did you do your jumps?

Do your jumps look like this?

Does this number line work?

What is the elapsed time?

• 5:45 to 6:30 is 45 minutes.
• 6:30 to 8:30 is 2 hours
• The elapsed time is 2 hours and 45 minutes.

Part 2

How else could the number line be marked?

Could we mark each 15 minute interval?  :15, :30, :45 of the hour?

Could we use fractions?  $\frac{1}{4},\:\frac{1}{2},\:\frac{3}{4}$

What other strategies could be used to find the elapsed time using a number line?

What are other ways to solve this problem using a number line?

Could you use 15 minute intervals to jump?

Could you jump so that all the end jumps are an hour?