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Recommended for: Grades 3-6

Resource: Lock Combinations of Knobs and Keys

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Media Type:
QuickTime Video

Length: 1m 49s
Size: 5.1 MB

In this video segment from Cyberchase, the CyberSquad must figure out the correct doorknob/key combination in order to open the door which stands between them and the Black Crystal. The CyberSquad has doorknobs in three different colors and keys in three different colors. After a few failed attempts, they decide to use a grid to help them keep track of the different combinations they have tried.

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Transcript (Rich Text Format Document)

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Teachers' Domain, Lock Combinations of Knobs and Keys, published October 8, 2008, retrieved on ,
http://www.teachersdomain.org/resource/vtl07.math.data.cou.lockcombo/

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: Let’s say you have a friend who really likes to coordinate her outfits. If she has three different color hats and two different color scarves, how many hat and scarf combinations does she have to choose from? How did you figure this out? Is there any opportunity to use multiplication to help you figure out the number of combinations?

Focus: In this video segment, you will watch Jackie and Matt as they try to find the correct doorknob/key combination to open a high security door. As they test some possible combinations, pay attention to what they do to make sure they try each combination without repeating or missing any possibilities.