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3-5

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## Sharing As a Model for Division

Students use manipulatives to share objects among different sized groups and practice dealing rounds as a division method. They learn to apply the method to problems using numbers and how to write these problems as multiplication and division facts.

### Overview

In this Cyberchase activity, students begin by using manipulatives to share objects among different sized groups. After watching a video clip in which Jackie shows Buzz, Delete, and Harold how to deal out rounds (or sets) of objects to solve the problem, the students work on a few division problems on their own. In a second video clip, Inez demonstrates how to solve such problems using numbers. With the handout, students learn to write these problems as multiplication and division facts.

3-5

### Suggested Time

60 minutes

### Media Resources

Sharing Halloween Candy QuickTime Video
Sharing Candy Among Gargoyles QuickTime Video

### Part I: Learning Activity

1. Read the following to your students: "You will watch a video clip of the CyberSquad celebrating Halloween by trick-or-treating. Jackie runs into Buzz, Delete, and Harold, all in costume. They are trying to share 18 candies evenly among the three of them. Each of you, in groups of three, should take 18 cubes from the manipulatives bin and show how you would share them equally among yourselves. Be prepared to discuss: a) How you did it, b) How many each person gets, and c) How you know your method works."

2. Discuss students' answers to the three questions.

3. Tell the students that they will now watch the video clip and see how their methods compare to Jackie's method. Ask them to remember the term Jackie uses to help her keep track.

4. Play the Sharing Halloween Candy QuickTime Video .

5. Discuss Jackie's method for sharing the candies with the students, and compare their methods with Jackie's.

6. Read the following to your students: "Also on Halloween, Hacker has created goblins to keep the citizens of Symmetria from having their annual 'Halloween Howl.' To break Hacker's spell over the gargoyles the CyberSquad must evenly share 35 candies among 7 gargoyles. They figure out how to do this using numbers as symbols for the candies. Working in pairs this time, see if you can share 35 candies among 7 gargoyles without manipulatives."

7. Tell the students that they will now watch a video clip in which the Cybersquad share 35 candies evenly among the 7 gargoyles.

8. Play the Sharing Candy Among Gargoyles QuickTime Video .

9. Ask the students to complete the Equal Shares of Candy Handout . Note: For question 1b, you would not have written it this way unless you already knew the answer and were checking it.

### Part II: Assessment

Assessment

Assessment: Level A (proficiency): Students practice their new partitioning skills by using manipulatives and write out the related multiplication and division facts.

Assessment: Level B (above proficiency): Students demonstrate knowledge of sharing by a unit greater than 1.

## Educational Standards

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