Curriculum  /  Math  /  2nd Grade  /  Unit 7: Working with Even, Odd, and Equal Groups  /  Lesson 1

Working with Even, Odd, and Equal Groups

Lesson 1

Math

Unit 7

2nd Grade

Lesson 1 of 12

Objective

Determine if a set of objects can be arranged into two equal groups.

Student-Facing

I can determine if a set of objects can be arranged into two equal groups.

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. Split sets of objects into two groups and notice totals that can be broken up equally and those that cannot. 
  2. Record the number of objects in each group, and in situations where there is a leftover and note the leftover. 
  3. Connect abstract totals to concrete representations, for example, students would represent 7 with 7 counters.

Tips for Teachers

  • Students build their working knowledge of even or odd in the first two lessons of the unit by making equal groups of concrete manipulatives to represent numbers, and relating this to real-world situations that can be modeled. Students are not expected to use or know the terms even or odd until they are introduced in Lesson 3 with a more formal definition. 
  • Note that the term remainder is introduced in fourth grade, so students should refer to it as a leftover in their second grade work.

Lesson Materials

Warm Up

5-10 minutes

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Anchor Tasks

15-25 minutes

Problem 1

For each number given on the Two Groups? Template, count out the total number of counters. Can the counters be shared equally between you and your partner? Record and model how many you each get and if there are any leftovers. 

Purpose

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Set Up

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Problem 2

Zach and Dana collected trading cards. Their parents said they must share their collection equally and bring home the same number of trading cards each.

a.   If they had 16 trading cards, how many would they each get to keep? Model with counters to show your thinking.

b.   They found 3 more trading cards.

  1. What is the new total?
  2. How many do they each get to keep now? Are there any leftovers?

Purpose

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Target Task

5-10 minutes

Alan and Trina have 15 bear counters. Count out 15 counters to model the situation.

a.   Can they share them equally? Explain your thinking.

b.   Will there be any leftovers? 

Student Response

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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

Determine if a set of objects can be arranged into groups of two.

Lesson 2
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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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