Elapsed Time Determining Start and End Times MountainHillRock

Elapsed Time & Determining Start and End Times Mountain-Hill-Rock Strategy

O’Clock First, lets review telling time A Quarter To or Until to Past or After Remember: The short hand shows the hour and the long hand shows the minutes. Half Past A Quarter past

What time is it? How many ways can you say it? 3: 10 Ten minutes after three

What time is it? How many ways can you say it? 1: 30 Half past one

What time is it? How many ways can you say it? 6: 45 15 minutes until 7 Quarter til 7

What time is it? How many ways can you say it? 4: 36 36 minutes after 4 24 minutes before 5

What is elapsed time? The word elapsed means “pass” or “go by”. Elapsed time is the amount of time that has passed or gone by when given two sets of time. Elapsed Time: 4 hours S Start Time: 7: 00 S End Time: 11: 00 S :

We will use the Mountain-Hill-Rock strategy for elapsed time. A mountain represents 1 hour A hill represents 10 or 5 minutes A rock represents 1 minute

Read the elapsed time problem and draw a timeline. Peter began his homework at 5: 15 pm and finished at 5: 35 pm. How long did it take him to do his homework?

Place the start time and end time on the time line at both ends. Peter began his homework at 5: 15 pm and finished at 6: 34 pm. How long did it take him to do his homework? 5: 12 5: 34

You try! An airplane left the Pgh International Airport at 9: 50 am and arrived at Orlando, Florida at 10: 30 am. How long did the trip take? Add it up!

You try! Jenn took her little sister shopping. They left their house at 11: 09 am and returned home at 11: 55 am. How long were they gone? Add it up!

You can use the Mountain-Hill-Rock strategy to determine the start or end time when given an amount of elapsed time. Jason is going to swim practice. Practice begins at 7: 23 pm and it will take 52 minutes to finish. What time will it be when he finishes practice? Start by making the timeline and placing the start time on the left side. On the right, place a box. You will be solving for the end time. 7: 23

Add the elapsed time (time needed for swim practice) using mountains, hills and rocks. Jason is going to swim practice. Practice begins at 7: 23 pm and it will take 52 minutes to finish. What time will it be when he finishes practice? Add 1 mountain and label the time under the timeline. 7: 23 pm Add the hills and label the time under the timeline. Add the rocks and label the time on the timeline and in the red box. The answer is, Jason will finish practice at 8: 15 pm. Be careful adding the 10 minutes here. You are going over a new hour.

You can use the Mountain-Hill-Rock strategy to determine the start or end time when given an amount of elapsed time. Erica is making dinner for her family. She wants to serve dinner at 5: 35. According to the recipe, it will take her 26 minutes to prepare the meal. What time should she begin preparing dinner in order to serve it on time? Start by making the timeline and placing the end time on the right side. On the left, place a box. You will be solving for the start time by working backwards. 5: 35

You try! Andrea’s bedtime is 9: 00 pm. She wants to watch a TV show that is 45 minutes long. What time should she start the movie in order to be in bed on time?

One More! Mario is taking a trip to the grocery store. He wants to arrive at 3: 15 pm. The trip will take 52 minutes. What time should he leave?