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Recommended for: Grades 4-8

Resource: How Many Rails for the Detour?

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Media Type:
QuickTime Video

Length: 2m 33s
Size: 7.6 MB

In this video segment from Cyberchase, the CyberSquad must build a rail line to get around the mountain to transport flowers gathered from Thornium Mountain. To do this they must complete decimal addition to figure out how long to make the new rail line. After looking at their sum, the CyberSquad believe that something is not quite right. They realize they did not line up the decimal points when they added the numbers, so they fix their mistake and add up the numbers again.

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Transcript (Rich Text Format Document)

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Teachers' Domain, How Many Rails for the Detour?, published August 25, 2008, retrieved on ,
http://www.teachersdomain.org/resource/vtl07.math.number.dec.railsdetou/

Frame and Focus
Follow Up
Connections
Standards

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Here are some Frame, Focus and Follow-up suggestions for using this video in a math lesson.

What is Frame, Focus and Follow-up?

Frame: When we talk about amounts or distances that are less than one we can use fractions or we can use decimals. Both describe quantities less than a whole. Have you ever had to add decimals together? How do you begin? Is the placement of the decimal point important?

Focus: As you watch this segment, you will see that the CyberSquad has to add three numbers. Notice what kind of numbers they are and how one of those numbers is different from the other two. Then watch as Jackie attempts to add them. She makes one mistake. See if you can tell what it is.