Curriculum  /  Math  /  2nd Grade  /  Unit 1: Adding and Subtracting Within 20  /  Lesson 15

Adding and Subtracting Within 20

Lesson 15

Math

Unit 1

2nd Grade

Lesson 15 of 15

Objective

Solve put together and take apart problems within 20.

Student-Facing

I can represent and solve word problems.

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.
  3. Represent problem with a related equation. 
  4. Solve equation using addition & subtraction strategies. 

Tips for Teachers

  • There are two Anchor Tasks for this lesson that address putting together and taking apart problems. If you find students need more help or guidance before the problem set, structure the problem set time to be team centered or release students to work on a problem and discuss. You can also use a gallery walk structure as well to look at and compare student representations and approaches.
  • 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: Manipulatives (As needed)
  • Optional: White board (1 per student)
  • Optional: Dry erase marker (1 per student)

Warm Up

5-10 minutes

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Anchor Tasks

15-25 minutes

Problem 1

Mr. Miles has medals for all of the students in the class for completing the Fun Run. There are 13 medals with blue ribbons and 7 with purple ribbons. How many medals does he have for the class?

Purpose

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Problem 2

Zach and Kerry buy 19 apples to use to make desserts. 7 of the apples are red and the rest are green. How many green apples do they have?

Purpose

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Problem Set

15-20 minutes

Target Task

5-10 minutes

Two 2nd grade classes were outside for recess. 7 students from Mr. Hayden's class went to the field to play tag. Some students from Ms. Louis' class joined them and there were 15 students playing tag. How many students from Ms. Louis' class joined?

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

Lesson Map

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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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