Curriculum  /  Math  /  2nd Grade  /  Unit 7: Working with Even, Odd, and Equal Groups  /  Lesson 5

Working with Even, Odd, and Equal Groups

Lesson 5

Math

Unit 7

2nd Grade

Lesson 5 of 12

Objective

Determine if numbers are even or odd and explain thinking.

Student-Facing

I can explain if numbers are even or odd in different ways.

Common Core Standards

Core Standards

  • 2.OA.C.3 — Determine whether a group of objects (up to 20) has an odd or even number of members, e.g., by pairing objects or counting them by 2s; write an equation to express an even number as a sum of two equal addends.

Foundational Standards

  • 1.OA.D.7

Criteria for Success

  1. Determine if a number is even or odd. 
  2. Explain if a given number is even or odd by describing the ability to make equal groups or pairs of two, or the ability to be represented by a sum of equal addends.

Tips for Teachers

In this lesson, students should explore patterns for even and odd numbers. Students will connect to more abstract forms, such as skip-counting by two and even noticing that numbers that end in 0, 2, 4, 6, or 8 are even. As students explain their reasoning and recognize patterns, be sure that if students explain with a pattern that they still have more conceptual understandings for even and odd, as pattern recognition in and of itself is not a complete and whole explanation.

Warm Up

5-10 minutes

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Anchor Tasks

15-25 minutes

Problem 1

Circle the expression in each pair that represents an even number. Be prepared to explain your thinking. 

a.   10 + 10 or 11 + 10

b.   7 + 6   or  5 + 3

c.   9 + 2 or 8 + 2

Purpose

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Problem 2

a.   Shade in the numbers you'd say as you skip-count by 2.

1 2 3 4 5 6 7 8 9 10
11 12 13 14 15 16 17 18 19 20

b.   Look at the numbers you shaded in. Are they even or odd? Explain your thinking.

c.   Look at the numbers you did not shade in. Are they even or odd? How do you know?

d.   Select a number that is odd. What could you add to or subtract from the number to make it even?

e.   Select a number that is even. Would it still be even if you added 1 or 2 more? Explain.

Purpose

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Problem Set

15-20 minutes

Target Task

5-10 minutes

Problem 1

For each number, circle whether the number is even or odd. 

a.   13

even or odd

b.   18

even or odd

c.   10

even or odd

Student Response

Problem 2

Write an equation to show that 16 is an even number. 

_____ + _____ = 16

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 rows of equal groups.

Lesson 6
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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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