Curriculum  /  Math  /  2nd Grade  /  Unit 1: Adding and Subtracting Within 20  /  Lesson 12

Adding and Subtracting Within 20

Lesson 12

Math

Unit 1

2nd Grade

Lesson 12 of 15

Objective

Represent story problems visually within 20.

Student-Facing

I can represent word problems visually and with a related equation.

Common Core Standards

Core Standards

  • 2.OA.A.1 — Use addition and subtraction within 100 to solve one- and two-step word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using drawings and equations with a symbol for the unknown number to represent the problem.

Foundational Standards

  • 1.OA.A.1

Criteria for Success

  1. Solve one-step word problems involving addition & subtraction.
  2. Represent problem visually, using pictures, drawings, words and numbers.
  3. Represent problem with a related equation. 
  4. Solve equation using addition & subtraction strategies.

Tips for Teachers

  • Students have seen these word problem subtypes in previous grades. This first word problem centered lesson is focused on attending to students ability to represent problems with a visual and related equation.
  • Visual representations can support students as they make sense of different problem types. This is a math skill that will continue to support them throughout their math careers. 
  •  This lesson can be used as an opportunity to preview tape diagrams. In Lesson 13 students will focus more on their precision with drawing tape diagrams that represent word problems. 
  • To help students understand word problems, using the 3 reads routine and acting out or modeling the problems could be used as an access point. Read more about word problems here.

Lesson Materials

  • Optional: White board (1 per student)
  • Optional: Dry erase marker (1 per student)
  • Optional: Manipulatives (As needed)

Warm Up

5-10 minutes

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Anchor Tasks

15-25 minutes

Problem 1

At the start of Kyre's birthday party he had 8 guests. Then some more of his cousins arrived and there were 14 guests. How many of Kyre's cousins joined the party?

Purpose

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Problem 2

There are 19 trees on the street that leads to school. Some of the trees were sick and had to be removed. There are now 12 trees. How many trees had to be removed?

Purpose

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Problem 3

The 18 students in classroom 24B can wear either a striped shirt or solid colored shirt as part of their uniform. On Tuesday 10 students wore solid colored shirts and the rest wore a striped shirt. How many students wore a striped shirt?

Purpose

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Target Task

5-10 minutes

Represent each story problem with a drawing and equation. 

a.   At the playground 18 bikes were parked at the bike racks. 6 bikes had training wheels and the rest did not. How many bikes did not have training wheels?

b.   Dakia brought in some stickers to share with her friends. Her sticker sheet had 15 stickers. After giving some away she had 6 stickers left. How many stickers did she give away?

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

Solve and represent story problems using tape diagrams.

Lesson 13
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Lesson Map

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

Topic A: Adding and Subtracting within 10 and Counting

Topic B: Strategies to Add and Subtract within 20

Topic C: Story Problems within 20

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