Standard

Partition a rectangle into rows and columns of same-size squares and count to find the total number of them.

Student language:

• "I can find the area of a rectangle."

Explanation

About the Math, Learning Targets, and Rigor

This standard calls for students to partition a rectangle into squares (or square-like regions) and then determine the total number of squares. This relates to the standard 2.OA.4 where students are arranging objects in an array of rows and columns.

This standard is also a precursor to learning about the area of a rectangle (See 3.MD.5 and 3.MD.6).

Example

Split the rectangle into 3 rows and 4 columns. How many small squares did you make?

An example so students can discover how this standard builds into multiplication.

1. Ask them to guess how many 1 unit by 1 unit squares will be inside this 2 unit by 2 unit square.
2. Students now draw this square and count the 1 by 1 unit squares inside it.
3. They compare this number to their guess.
4. Next, students draw a 2 unit by 3 unit rectangle and count how many 1 unit by 1 unit squares are inside.
5. Now they choose the two dimensions for a rectangle, predict the number of 1 unit by 1 unit squares inside, draw the rectangle, count the number of 1 unit by 1 unit squares inside and compare this number to their guess.
6. Students repeat this process for different-size rectangles.
7. Finally, ask them to what they observed as they worked on the task.

Resources

Videos

• Khan Academy
  • scroll to find 2.G.2, click on a skill, watch videos on left side in each skill
• Learn Zillion

EngageNY Lessons

Extra Practice

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

Released Assessment Questions

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