Curriculum / Math / 2nd Grade / Unit 2: Adding and Subtracting Within 100 / Lesson 21

Adding and Subtracting Within 100

Lesson 21

Math

Unit 2

2nd Grade

Lesson 21 of 21

Lesson Map

Topic A: Adding & Subtracting with Multiples of Ten

Lesson

Add and subtract 1 and 10 to or from two-digit numbers within 100.

Standards

2.NBT.B.5

Lesson

Add and subtract multiples of ten to two-digit numbers.

Standards

2.NBT.B.5

Lesson

Use make a ten strategies to add two-digit numbers within 50.

Standards

2.NBT.B.5

Topic B: Strategies for Adding within 100

Lesson

Use base ten blocks to represent adding within 100.

Standards

2.NBT.B.5

Lesson

Use math drawings to represent adding within 100.

Standards

2.NBT.B.5

Lesson

Use place value knowledge to add within 100.

Standards

2.NBT.B.5

Lesson

Use properties of operations and other strategies to add within 100.

Standards

2.NBT.B.5

Lesson

Relate the standard algorithm for addition to other methods to add and explain thinking.

Standards

2.NBT.B.52.NBT.B.9

Topic C: Strategies for Subtracting within 100

Lesson

Use base ten blocks and place value drawings to represent subtracting within 100.

Standards

2.NBT.B.5

Lesson

Relate addition and subtraction to subtract within 100.

Standards

2.NBT.B.5

Lesson

Use place value knowledge to subtract with one decomposition.

Standards

2.NBT.B.5

Lesson

Use properties of operations to subtract within 100.

Standards

2.NBT.B.52.NBT.B.9

Lesson

Relate subtraction with place value drawings to the standard algorithm.

Standards

2.NBT.B.52.NBT.B.9

Lesson

Relate subtraction with place value drawings to the standard algorithm in situations with one decomposition and explain thinking.

Standards

2.NBT.B.52.NBT.B.9

Topic D: Working within 100 and Categorical Data

Lesson

Represent and solve compare story problems within 100 (Day 1).

Standards

2.NBT.B.52.OA.A.1

Lesson

Represent and solve compare story problems within 100 (Day 2).

Standards

2.NBT.B.52.OA.A.1

Lesson

Use place value strategies to add 4 two-digit numbers within 100.

Standards

2.NBT.B.6

Lesson

Use flexible strategies to add 4 two-digit numbers within 100.

Standards

2.NBT.B.6

Lesson

Use strategies to add and subtract within 100 and explain thinking.

Standards

2.NBT.B.52.NBT.B.9

Lesson

Interpret and create picture graphs and answer related questions.

Standards

2.MD.D.10

Lesson

Interpret and create bar graphs and answer related questions.

Standards

2.MD.D.10

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Adding and Subtracting Within 100

Objective

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Student-Facing

Common Core Standards

Core Standards

Measurement and Data

Foundational Standards

Measurement and Data

Measurement and Data

Operations and Algebraic Thinking

Operations and Algebraic Thinking

Criteria for Success

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Warm Up

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Anchor Tasks

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Problem 1

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Purpose

Problem 2

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Purpose

Problem 3

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Purpose

Problem Set

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Target Task

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Student Response

Additional Practice

Word Problems and Fluency Activities

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