Curriculum  /  Math  /  2nd Grade  /  Unit 7: Working with Even, Odd, and Equal Groups  /  Lesson 9

Working with Even, Odd, and Equal Groups

Lesson 9

Math

Unit 7

2nd Grade

Lesson 9 of 12

Objective

Use concrete squares to build rectangles.

Student-Facing

I can use concrete squares to build rectangles.

Common Core Standards

Core Standards

  • 2.G.A.2 — Partition a rectangle into rows and columns of same-size squares and count to find the total number of them.

Foundational Standards

  • 1.OA.D.7

Criteria for Success

  1. Compose complete rectangles with square inch tiles. 
  2. Model composed rectangles pictorially using grid paper to show arrays formed as rectangles. 
  3. Find the total number of equal-sized squares that make up a rectangle by counting or using a repeated addition equation.

Tips for Teachers

  • In the previous lessons in this topic, students have learned about the structure of arrays as equal groups of rows or columns. In this lesson, they will use that structure and concrete manipulatives to build arrays and see them as completed rectangles made up of smaller squares. This will help students eventually partition rectangles into equal squares and find the total number of squares in a given rectangle.
  • Students will need grid paper for their work on the problem set.

Lesson Materials

  • Square inch tiles (25 per student)
  • Square Inch Grid Template (10 per student) — Some of these are needed for the Problem Set

Warm Up

5-10 minutes

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Anchor Tasks

15-25 minutes

Problem 1

a.   Use 8 square tiles to build an array on Square Inch Grid Template.

b.   Push your square tiles from your array together to form a rectangle with no gaps or overlaps. Shade in the grid to model the rectangle you built.

c.   Write a repeated addition equation to represent the total number of equal-size squares in the rectangle.

Purpose

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Set Up

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Problem 2

Select two options to build and model rectangles. Check to make sure you have equal rows and equal columns. 

Option 1: 14

Option 2: 16

Option 3: 25

Option 4: 24

a.   Which option above did you choose?

  1. Build a rectangle with square tiles to form equal rows and/or columns on Square Inch Grid Template.
  2. Shade in the grid to model the rectangle you built.
  3. Write a repeated addition equation to show the total number of equal-size squares in the rectangle.

b.   Which option above did you choose?

  1. Build a rectangle with square tiles to form equal rows and/or columns on Square Inch Grid Template.
  2. Shade in the grid to model the rectangle you built.
  3. Write a repeated addition equation to show the total number of equal-size squares in the rectangle.

Purpose

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Set Up

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Problem Set

15-20 minutes

Target Task

5-10 minutes

Use 15 square inch tiles to build a rectangle.

a.   Shade in the boxes to show a rectangle with 15 squares.

b.   Write a repeated addition equation to show the total number of equal-size squares in the rectangle.

Student Response

Additional Practice

Daily Word Problems, Warm Ups, and Center Activities are aligned to the content of the unit but not necessarily to the lesson objective, therefore feel free to use them anytime during your school day.

Word Problems and Fluency Activities

Next

Draw rectangles to model equal groups of rows or columns.

Lesson 10
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Lesson Map

A7CB09C2-D12F-4F55-80DB-37298FF0A765

Topic A: Even and Odd Numbers

Topic B: Composing and Analyzing Arrays

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