Measuring Object Length on a Number Line

Lesson Plan for Grades 4-7
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U.S. Department of Education

Funding for the VITAL/Ready to Teach collection was secured through the United States Department of Education under the Ready to Teach Program.

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Everyday Math (2004)
Teacher Lesson Guide: pp. 242-246, 250, 253-254, 264, 284, 306, 618
Teacher Reference Manual: pp. 47, 202, 204, 231
Student Reference Book: pp. 104, 152, 166-168
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Overview

In this Cyberchase activity, students watch a video clip in which a square is measured incorrectly by starting from the 1 inch mark. After students learn to measure from the 0 mark, they are taught to measure objects that are not aligned with 0 by creating a number sentence using subtraction.

Grade Level:

4-7

Suggested Time

1 hour

Media Resources

The Measurement Debate QuickTime Video

Materials

Handout : "Measuring Objects"
Assessment: Level A
Assessment: Level B
Answer Key

The Lesson

Part I: Learning Activity

1. Read the following to your students: "In this Cyberchase episode, when the Hacker convinces Mr. Zero to leave Gollywood, the number 0 disappears from the city. Britney and Mary-Pat, two twin movie stars, are about to place their handprints on the walk of fame, but they have a disagreement about the size of their squares. Watch the video clip to see how the absence of 0 leads to a misunderstanding and pay attention to how the CyberSquad resolves the problem."

2. Play the The Measurement Debate QuickTime Video .

3. Distribute Handout : "Measuring Objects" .

4. Discuss the handout.

Part II: Assessment

Assessment: Level A (proficiency): Students practice measuring objects from zero, and some that do not start from zero, with lengths and positions that include quarters and halves.

Assessment: Level B (above proficiency): Students practice measuring objects with lengths and positions that include eighths, quarters, and halves.