Enjoy any 5 free lessons!
You can pick. No account needed.
Watch VideoBecome a member to get full access to our entire library of learning videos, reading material, quiz games, simple DIY activities & more.
Become a member to get full access to our entire library of learning videos, quiz games, & more.
Plans & Pricingto watch this full video.
Access All Videos
and Lessons, No Limits.
Access All Videos
No credit card required,
takes 7 sec to signup.
No card required
Readytogo lessons
that save you time.
Readytogo lessons
If you are on a school computer or network, ask your tech person to whitelist these URLs:
*.wistia.com, fast.wistia.com, fast.wistia.net, embedwistiaa.akamaihd.net
Sometimes a simple refresh solves this issue. If you need further help, contact us.
Measure Elapsed Time
 Show lesson plan & teacher guide
 Show answers to discussion questions
 Show video only
 Allow visiting of other pages
 Hide assessments
 We’ll learn about elapsed time.
 That we can use the number line to measure elapsed time to the nearest minute!
 And that we can use this knowledge to find out how long it takes to do things like attend sporting events, get ready for school, and watch a movie!

Discussion Questions

Before VideoEvan put a sandwich in the oven when his clock showed the hour hand pointing between the 7 and the 8. The minute hand was pointing directly at the 6. What time did the sandwich go in the oven? How can you tell?ANSWER

It is 7:30. The hour hand tells you that it is after 7 o’clock, and not yet 8 o’clock. The minute hand tells you it is 30 minutes after 7:00, so it is 7:30.

Each number on the clock face stands for the hour of the day, but it also stands for 5minute intervals. You can count by 5s to find how many minutes it is after an hour.

You can add the minutes. Even put the sandwich in at 30 minutes past 7. 10 more than 30 is 40. Evan takes his sandwich out of the oven at 7:40.

It was 4:00 p.m. You can subtract 1 hour from the hours of the time. 5 – 1 = 4.

60 minutes pass between 4:00 and 5:00 because it is one hour, and one hour is the same amount of time as 60 minutes. Half an hour passes between 5:00 and 5:30, because 30 minutes is the same amount of time as half an hour.


After VideoHow can you find the elapsed time between 9:30 a.m. and noon, in hours? ANSWER

Noon is the same as 12:00 p.m., so I can use a number line and hop 2 hours from 9:30 to 11:30, then another half hour to noon, for a total of 2 ½ hours.

Use a number line. Given the start time, you hop forward to add the elapsed time and find the end time. 4:00 plus half an hour is 4:30 p.m. Given the end time, you hop backward to subtract the elapsed time and find the start time. 5:00 minus half an hour is 4:30 p.m.

Jason must leave before the start of his lesson, so I need to hop backward on the number line to find out what time he should leave: 1:00 p.m.

You could jump one hour, then jump in 5minute intervals, like on a clock, to find the end time. Or, you could jump two hours, then jump back 20 minutes, because 40 minutes is 20 minutes less than one hour.

Kari is not correct. Start at 7:40 and count forward 37 minutes on a number line to find 8:17 p.m. This is after Kari’s class starts, so she will be late.



Vocabulary

Elapsed time
DEFINE
The amount of time that passes between a start time and an end time.

O'clock
DEFINE
Means ‘of the hour’ and is used to tell that the current time is exactly on a given hour.

Number line
DEFINE
A straight line that is used to show the relationship between values. Points on the line indicate the relative position of numbers or values.

Hour
DEFINE
A unit of time that is equal to 60 minutes.

Halfhour
DEFINE
A unit of time that is equal to 30 minutes, which is half as long as one hour.

Minute
DEFINE
A unit of time that is equal to 60 seconds. There are 60 minutes in one hour.

Elapsed time
DEFINE

Reading Material
Download as PDF Download PDF View as Separate PageWHAT IS ELAPSED TIME?Elapsed time is the amount of time that passes between a starting time and an ending time.
To better understand measuring elapsed time…
WHAT IS ELAPSED TIME?. Elapsed time is the amount of time that passes between a starting time and an ending time. To better understand measuring elapsed time…LET’S BREAK IT DOWN!
Basketball Time
Elapsed time can help you find how many hours you spend at a basketball game. Let’s say you arrive at the game at 2:00 p.m. You leave the game at 3:30 p.m. We can use a number line to help find the difference between the two times. We can start at 2:00 p.m. and jump one hour to 3:00 p.m. Then, we can jump another half hour to reach 3:30 p.m. Try this one yourself: You arrive at a volleyball game at 9:30 a.m. You leave the game at 11:00 a.m. How long were you at the volleyball game?
Basketball Time Elapsed time can help you find how many hours you spend at a basketball game. Let’s say you arrive at the game at 2:00 p.m. You leave the game at 3:30 p.m. We can use a number line to help find the difference between the two times. We can start at 2:00 p.m. and jump one hour to 3:00 p.m. Then, we can jump another half hour to reach 3:30 p.m. Try this one yourself: You arrive at a volleyball game at 9:30 a.m. You leave the game at 11:00 a.m. How long were you at the volleyball game?Travel Time
A number line can help you find the length of time you travel. Let’s say your plane takes off at 9:30 a.m. and lands at 3:15 p.m. We can draw a number line with 9:30 a.m. marked as a starting point and 3:15 p.m. marked as an ending point. We can jump from 9:30 a.m. to 2:30 p.m. in 5 onehour jumps. Then we jump 30 more minutes from 2:30 to the next hour, 3:00. From 3:00, jump another 15 minutes to 3:15. You travel for 5 hours and 30 + 15 = 45 minutes. Try this one yourself: Your bus leaves your city at 1:50 p.m. It arrives in your aunt’s town at 5:20 p.m. How long is the bus ride from your city to your aunt’s town?
Travel Time A number line can help you find the length of time you travel. Let’s say your plane takes off at 9:30 a.m. and lands at 3:15 p.m. We can draw a number line with 9:30 a.m. marked as a starting point and 3:15 p.m. marked as an ending point. We can jump from 9:30 a.m. to 2:30 p.m. in 5 onehour jumps. Then we jump 30 more minutes from 2:30 to the next hour, 3:00. From 3:00, jump another 15 minutes to 3:15. You travel for 5 hours and 30 + 15 = 45 minutes. Try this one yourself: Your bus leaves your city at 1:50 p.m. It arrives in your aunt’s town at 5:20 p.m. How long is the bus ride from your city to your aunt’s town?Ready for School
When you know how long it takes you to get ready for school, and what time your bus comes, you can use elapsed time to help you figure out when you need to get out of bed. Let’s say it takes you 10 minutes to shower, 15 minutes to get dressed, and 13 minutes to eat breakfast. That’s a total of 10 + 15 + 13 = 38 minutes. Your bus comes at 6:55 a.m. We can use a number line and jump back 38 minutes from the time your bus comes. From 6:55, jump back 30 minutes to 6:25. Then, jump back 5 more minutes to 6:20. We still need to jump back 3 more minutes, to 6:17. You need to get out of bed at 6:17 a.m. Try this one yourself: School starts at 7:22 a.m. It takes you 16 minutes to walk to school, 25 minutes to get ready for school, and 9 minutes to eat breakfast. What time do you need to wake up?
Ready for School When you know how long it takes you to get ready for school, and what time your bus comes, you can use elapsed time to help you figure out when you need to get out of bed. Let’s say it takes you 10 minutes to shower, 15 minutes to get dressed, and 13 minutes to eat breakfast. That’s a total of 10 + 15 + 13 = 38 minutes. Your bus comes at 6:55 a.m. We can use a number line and jump back 38 minutes from the time your bus comes. From 6:55, jump back 30 minutes to 6:25. Then, jump back 5 more minutes to 6:20. We still need to jump back 3 more minutes, to 6:17. You need to get out of bed at 6:17 a.m. Try this one yourself: School starts at 7:22 a.m. It takes you 16 minutes to walk to school, 25 minutes to get ready for school, and 9 minutes to eat breakfast. What time do you need to wake up?The Movies
Elapsed time can also be used to find when a movie will be over. Let’s say a movie starts at 6:50 p.m. The movie is 1 hour and 55 minutes long. We can find what time the movie ends using a number line. Label the start time at 6:50. Jump forward 1 hour to 7:50. Then jump 10 minutes to the next hour, 8:00, which leaves 55 – 10 = 45 minutes. The movie ends at 8:45 p.m. Try this one yourself: A movie starts at 4:15 p.m. and it lasts 2 hours and 10 minutes. What time will the movie be over?
The Movies Elapsed time can also be used to find when a movie will be over. Let’s say a movie starts at 6:50 p.m. The movie is 1 hour and 55 minutes long. We can find what time the movie ends using a number line. Label the start time at 6:50. Jump forward 1 hour to 7:50. Then jump 10 minutes to the next hour, 8:00, which leaves 55 – 10 = 45 minutes. The movie ends at 8:45 p.m. Try this one yourself: A movie starts at 4:15 p.m. and it lasts 2 hours and 10 minutes. What time will the movie be over? 
Practice Word Problems

Practice Number Problems

Teacher Resources
These downloadable teacher resources can help you create a full lesson around the video. These PDFs incorporate using class discussion questions, vocabulary lists, printable math worksheets, quizzes, games, and more.
Select a Google Form
Choose a way to play this quiz game

Questions appear on the teacher's screen. Students answer on their own devices.
Start a Free Trial Today. Get a $5 Amazon Gift Card!
Teachers! Start a free trial & we'll send your gift card within 1 day. Only cards left. Try it now.
This email is associated with a Science Kit subscription. Kit subscriptions are managed on this separate page: Manage Subscription

Science & Math$_{/yr}

Science Only$_{/yr}
Naomi starts reading at 1:30 p.m. She finishes at 3:00 p.m. How long did Naomi read?
Marcus left his house at 8:50 a.m. He walked 12 minutes to the park, played basketball for 1 hour 42 minutes, and then walked 12 minutes to get home. What time did Marcus get home?
Ben finished a 45minute band practice at 12:37 p.m. He said practice started at 11:08 a.m. Explain why Ben is not correct.
access all lessons
• No credit card required •
"My students loved the videos. I started the video subscription in May and used them as a review before the state test, which I know contributed to 100% of my class passing the state test."
Rhonda Fox 4th Grade Teacher, Ocala, Florida• No credit card required •
"My students loved the videos. I started the video subscription in May and used them as a review before the state test, which I know contributed to 100% of my class passing the state test."
Rhonda Fox 4th Grade Teacher, Ocala, Florida• No credit card required •
Already a member? Sign In
* no credit card required *
* no credit card required *
* no credit card required *
no credit card required
Skip, I will use a 3 day free trial
Enjoy your free 30 days trial

Unlimited access to our full library
of videos & lessons for grades K5. 
You won’t be billed unless you keep your
account open past your 14day free trial. 
You can cancel anytime in 1 click on the
manage account page or by emailing us.

Unlimited access to our full library of videos & lessons for grades K5.

You won't be billed unless you keep your account open past 14 days.

You can cancel anytime in 1click on the manage account page.
Cancel anytime in 1click on the manage account page before the trial ends and you won't be charged.
Otherwise you will pay just $10 CAD/month for the service as long as your account is open.
Cancel anytime on the manage account page in 1click and you won't be charged.
Otherwise you will pay $10 CAD/month for the service as long as your account is open.
We just sent you a confirmation email. Enjoy!
DonePlease login or join.