Elapsed Time Strategies with Mountains, Hills, and Rocks

This video tutorial demonstrates how to find elapsed time using an open number line with the mountains, hills, and rocks strategy. The instructor explains that a mountain represents one hour, a hill represents 5 to 30 minutes, and a rock represents one minute. A word problem is presented where the start and end times are given, and the elapsed time is calculated using these symbols. The process involves placing symbols on the number line, recording times, and summing up the hours and minutes to find the total elapsed time of 3 hours and 38 minutes.

What does a mountain symbolize in the context of elapsed time?

• 1 minute

• 5 minutes

• 30 minutes

• 1 hour

Tags

CCSS.RI.7.7

CCSS.RI.9-10.7

CCSS.RL.6.7

CCSS.RL.8.7

CCSS.RL.9-10.7

What range of time does a hill represent?

• 1 hour

• 5-30 minutes

• 1-5 minutes

• 30-60 minutes

What does a rock symbolize in the context of elapsed time?

• 1 hour

• 30 minutes

• 5 minutes

• 1 minute

Tags

CCSS.1.MD.B.3

Which of the following is NOT a correct representation of time increments?

• Rock = 1 minute

• Hill = 5-30 minutes

• Mountain = 1 hour

• Rock = 5 minutes

Tags

CCSS.4.MD.A.2

At what time did the race start?

• 8:00 a.m.

• 9:00 a.m.

• 10:00 a.m.

• 11:00 a.m.

Tags

CCSS.1.MD.B.3

How many hours had passed by 11:00 a.m.?

• 1 hour

• 3 hours

• 2 hours

• 4 hours

Tags

CCSS.1.MD.B.3

How many mountains were used to reach 11:00 a.m.?

• 2

• 3

• 4

• 1

What increment of time was used to represent the final minutes to reach 11:38 a.m.?

• 1 minute

• 30 minutes

• 10 minutes

• 5 minutes

What was the first time increment used after 11:00 a.m.?

• A rock

• A hill

• A mountain

• None

Tags

CCSS.3.MD.A.1

How long did it take the winning team to complete the race?

• 3 hours and 38 minutes

• 3 hours and 30 minutes

• 2 hours and 58 minutes

• 4 hours

Tags

CCSS.3.MD.A.1