Curriculum  /  Math  /  2nd Grade  /  Unit 5: Adding and Subtracting Within 1,000  /  Lesson 21

Adding and Subtracting Within 1,000

Lesson 21

Math

Unit 5

2nd Grade

Lesson 21 of 25

Objective

Solve one-step word problems using strategies to solve within 100.

Student-Facing

I can solve one-step word problems and use strategies to solve. 

Common Core Standards

Core Standards

  • 2.NBT.B.5 — Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.
  • 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.NBT.C.4
  • 1.NBT.C.5
  • 1.NBT.C.6
  • 1.OA.A.1
  • 1.OA.D.8

Criteria for Success

  1. Solve one-step word problems involving addition & subtraction within 100.
  2. Represent problems with a tape diagram and an equation with a symbol for the unknown.
  3. Solve using a flexible strategy.

Tips for Teachers

In this lesson students will encounter different word problem types excluding compare problems. 

Warm Up

5-10 minutes

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Anchor Tasks

15-25 minutes

Problem 1

a.   TJ was cleaning up the toys in his room. He put 65 legos in his bin. He found 28 more legos under his bed and put them back in the bin. How many legos did TJ put in the bin? Solve. 

b.   While cleaning his room TJ found some legos under his bed and put them in the bin. He found 65 more legos in other parts of his room and put them in the bin. If he had a total of 93 legos in his bin, how many of the legos were under his bed? Solve. 

c.   Be prepared to discuss how these problems are similar and how they are different.

Purpose

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Problem 2

There were some candies at the birthday party. The kids ate 48 pieces of candy. Then there were 52 pieces of candy left. How many pieces of candy were there at the start of the party? Solve. 

Purpose

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Problem Set

15-20 minutes

Target Task

5-10 minutes

On a busy Saturday there were a lot of children at the arcade. 18 left to go home. Then there were 82 left at the arcade. How many children were there before?

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 two-step word problems using strategies to solve within 100.

Lesson 22
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Lesson Map

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

Topic A: Adding with Mental Strategies

Topic B: Adding within 1,000

Topic C: Subtracting with Mental Strategies

Topic D: Subtracting within 1,000

Topic E: Story Problems and Explaining Addition and Subtracting Thinking

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