Standard

Generate measurement data by measuring lengths of several objects to the nearest whole unit, or by making repeated measurements of the same object. Show the measurements by making a line plot, where the horizontal scale is marked off in whole-number units.

Student language:

• "I can make a table to organize data."
• "I can use a table to make a line plot."

Explanation

About the Math, Learning Targets, and Rigor

This standard calls for students to represent the length of several objects by making a line plot. Students should round their lengths to the nearest whole unit. Line plots are first introduced in this grade level.

Example

A class measures pencils in the classroom to the nearest inch, display data collected on a line plot (below).

• How many objects measured 2 inches? 3 inches?
• Which length had the most number of objects? How do you know?

Tips for Line Plots

• The line plot is made by simply drawing a number line then placing an X above the corresponding value on the line that represents each piece of data.
• Make sure students understand that the Xs need to be of consistent size and are lined up similar to a bar graph.
• Line plots are essentially bar graphs but use an X instead of a longer bar to designate a point of data. They are generally quicker to make as well.

Resources

Videos

• Khan Academy
  • scroll to find 2.MD.9, click on a skill, watch videos on left side in each skill

EngageNY Lessons

Extra Practice

• North Carolina Tasks
• Illustrative Math Tasks
• Howard County Tasks
  • Click on 2nd grade at bottom, then 2.MD.9
• Common Core Sheets

Released Assessment Questions

2.MD.9 Student Example

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