Curriculum  /  Math  /  2nd Grade  /  Unit 7: Working with Even, Odd, and Equal Groups  /  Lesson 6

Working with Even, Odd, and Equal Groups

Lesson 6

Math

Unit 7

2nd Grade

Lesson 6 of 12

Objective

Build and describe arrays as rows of equal groups.

Student-Facing

I can build and describe arrays as rows 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 equal rows. 
  2. Understand that when items are arranged in a line from left to right that is a row. 
  3. Identify and count rows in a given array, and count the number of items in each row. 
  4. Represent the total of a given array with a repeated addition sentence.

Tips for Teachers

The focus of this lesson is for students to formally define and work with arrays and their rows specifically. They will identify rows in arrays and use the number of items in each row to help determine the total by counting and creating repeated addition equations. In Lesson 7, students will be introduced to columns. Differentiating between rows and columns can be complex, so we have separated their work with both over two lessons.

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 each group of counters and determine how many counters there are.

a.   

b.   

c.   

d.   

e.   

Purpose

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Problem 2

Look at each array and answer the questions that follow.

a.   

  1. How many counters are shaded?
  2. When objects are arranged in a line from left to right, that is called a row. Circle each row of counters. The first one has been done for you.
  3. How many rows are there?
  4. How many counters are there in the whole array?
  5. Write a repeated addition equation to show the total.

b.   

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

c.   

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

Purpose

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Problem 3

a.   Use 18 counters to build an array with 6 rows.

b.   How many counters are in each row?

c.   Draw your array.

d.   Model another array with 18 counters but with 3 rows.

e.   How many counters are in each row?

f.   Draw your array.

Purpose

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Problem Set

15-20 minutes

Target Task

5-10 minutes

Look at the following array.

a.   How many triangles are in each row?

b.   How many rows are there?

c.   Write a repeated addition equation to represent the total number of triangles.

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 describe arrays as columns of equal groups.

Lesson 7
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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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