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Elapsed Time

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Elapsed Time

Mathematics

Common Core 3.MD.1

Grade 3

Mindy Godwin

July 15, 2013

- Objective
- Using a number line, learners will be able to determine elapsed time by identifying starting, ending, and in-between times of activities.

- Common Core Mathematics Standard
- 3.MD.1 Tell and write time to the nearest minute and measure time intervals in minutes. Solve word problems involving addition and subtraction of time intervals in minutes, e.g., by representing the problem on a number line diagram.

Standard & Objective

Content

Posttest

Credits

Exit Show

- What is elapsed time? Let’s define it!
- The time that has passed between two events
OR…

- The difference between two times
ALSO…

- The time that can be measured between the beginning and the end of an activity

- The time that has passed between two events

- Reminder: Time is counted in base-60. There are sixty minutes in every hour!
- We cannot do vertical subtraction using base-10 to find elapsed time. Can we find another way?

Elapsed Time: 75 mins. OR 1 hour, 15 mins.

+15 minutes

- 10:00 am

- Start
- Begin

- Base-60
- Hour

- Finish
- End

- 9:00 am

- 10:15 am

+60 minutes

Can you think of any real-world situations where elapsed time is important?

- What about baking a cake?
- What about getting ready before school?
Elapsed Time Video

- 12:15 pm
- 12:21 pm
- 12:14 pm
- 12:07 pm

- 1 hour, 15 minutes
- 1 hour, 45 minutes
- 2 hours
- 2 hours, 45 minutes

- 11:00 am
- 12:00 pm
- 10:40 am
- 11:10 am

- 1:41 pm
- 1:53 pm
- 1:38 pm
- 2:01 pm

- 4:00 pm
- 3:45 pm
- 3:55 pm
- 3:50 pm

donaldsonm. (2010, June 1). Elapsed Time. Retrieved from SMARTExchange: http://exchange.smarttech

.com/details.html?id=d657b291-ac40-4a5b-a4d9-9bf574e680fc

Everette, M. (2013, January 11). Teaching Elapsed Time: Strategies That Work. Retrieved from Scholastic: http://www.scholastic.com/teachers/top-teaching/2013/01/teaching-elapsed-time-strategies-work

Scholastic. (2013). Measurement: Elapsed Time.Retrieved from StudyJamz: http://studyjams.scho

lastic.com/studyjams/jams/math/measurement/elapsed-time.htm