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

Working with Even, Odd, and Equal Groups

Lesson 7

Math

Unit 7

2nd Grade

Lesson 7 of 12

Objective

Build and describe arrays as columns of equal groups.

Student-Facing

I can build and describe arrays as columns of equal groups.

Common Core Standards

Core Standards

  • 2.OA.C.4 — Use addition to find the total number of objects arranged in rectangular arrays with up to 5 rows and up to 5 columns; write an equation to express the total as a sum of equal addends.

Foundational Standards

  • 1.OA.D.7

Criteria for Success

  1. Understand that an array is a way to arrange items in rows and columns. 
  2. Understand that when items are arranged in a line from top to bottom that is a column. 
  3. Identify and count the number of columns in a given array, and count the number of items in each column. 
  4. Represent the total of a given array with a repeated addition sentence.

Tips for Teachers

Lesson Materials

  • Two-sided counters (25 per student)

Warm Up

5-10 minutes

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Anchor Tasks

15-25 minutes

Problem 1

Look at the following array.

a.   

  1. How many counters are shaded?
  2. When items are arranged in a straight line from top to bottom, that is called a column. Circle each column of counters. The first one has been done for you.
  3. How many columns are there?
  4. How many counters in each column?
  5. How many counters are there in total? Write a repeated addition equation to represent the total.

b.   

  1. Circle each column of counters. 
  2. How many counters are in each row?
  3. How many counters are there?
  4. Write a repeated addition equation to show the total.

Purpose

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Problem 2

a.   The numbers in each repeated addition expression represent the number of counters in each column. Draw the array to match.

  1. 3 + 3
  2. 4 + 4 + 4 + 4 + 4
  3. 5 + 5 + 5
  4. 2 + 2 + 2 + 2 + 2 + 2

b.   Draw an array with 16 counters and 4 columns. 

  1. How many counters are in each column?
  2. Write a repeated addition equation to represent the total.

Purpose

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Problem Set

15-20 minutes

Target Task

5-10 minutes

Problem 1

Dr. Harris is making some ice cream sandwich cookies. Each sandwich is made of 2 cookies and ice cream in the middle. She has 12 cookies to use.

a.   Draw an array to represent the 12 cookies in 2 columns.

b.   How many cookies are in each column?

Student Response

Problem 2

Look at the following array.

a.   How many columns are shown?

b.   Write a repeated addition equation to represent the total shown.

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

Build and represent various arrays with the same total.

Lesson 8
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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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