### Singapore Math

# Dimensions Math Teacher's Guide 2A

**Dimensions Math ^{®} Teacher's Guide 2A**Chapter 1: Numbers to 1,000

Teaching Notes

Chapter Opener

Lesson 1: Tens and Ones

Lesson 2: Counting by Tens or Ones

Lesson 3: Comparing Tens and Ones

Lesson 4: Hundreds, Tens, and Ones

Lesson 5: Place Value

Lesson 6: Comparing Hundreds, Tens, and Ones

Lesson 7: Counting by Hundreds, Tens, or Ones

Lesson 8: Practice

Workbook Solutions

Chapter 2: Addition and Subtraction — Part 1

Teaching Notes

Chapter Opener

Lesson 1: Strategies for Addition

Lesson 2: Strategies for Subtraction

Lesson 3: Parts and Whole

Lesson 4: Comparison

Lesson 5: Practice

Workbook Solutions

Chapter 3: Addition and Subtraction — Part 2

Teaching Notes

Chapter Opener

Lesson 1: Addition Without Regrouping

Lesson 2: Subtraction Without Regrouping

Lesson 3: Addition with Regrouping Ones

Lesson 4: Addition with Regrouping Tens

Lesson 5: Addition with Regrouping Tens and Ones

Lesson 6: Practice A

Lesson 7: Subtraction with Regrouping from Tens

Lesson 8: Subtraction with Regrouping from Hundreds

Lesson 9: Subtraction with Regrouping from Two Places

Lesson 10: Subtraction with Regrouping across Zeros

Lesson 11: Practice B

Lesson 12: Practice C

Workbook Solutions

Chapter 4: Length

Teaching Notes

Chapter Opener

Lesson 1: Centimeters

Lesson 2: Estimating Length in Centimeters

Lesson 3: Meters

Lesson 4: Estimating Length in Meters

Lesson 5: Inches

Lesson 6: Using Rulers

Lesson 7: Feet

Lesson 8: Practice

Workbook Solutions

Chapter 5: Weight

Teaching Notes

Chapter Opener

Lesson 1: Grams

Lesson 2: Kilograms

Lesson 3: Pounds

Lesson 4: Practice**Review 1**

Workbook Solutions

Chapter 6: Multiplication and Division

Teaching Notes

Chapter Opener

Lesson 1: Multiplication — Part 1

Lesson 2: Multiplication — Part 2

Lesson 3: Practice A

Lesson 4: Division — Part 1

Lesson 5: Division — Part 2

Lesson 6: Multiplication and Division

Lesson 7: Practice B

Workbook Solutions

Chapter 7: Multiplication and Division of 2, 5, and 10

Teaching Notes

Chapter Opener

Lesson 1: The Multiplication Table of 5

Lesson 2: Multiplication Facts of 5

Lesson 3: Practice A

Lesson 4: The Multiplication Table of 2

Lesson 5: Multiplication Facts of 2

Lesson 6: Practice B

Lesson 7: The Multiplication Table of 10

Lesson 8: Dividing by 2

Lesson 9: Dividing by 5 and 10

Lesson 10: Practice C

Lesson 11: Word Problems**Review 2**

Workbook Solutions

Blackline Masters for 2A

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**Dimensions Math ^{®}**

**PreK-5 series**features the progression, rigor, and pacing that define Singapore math. Throughout the series, five characters offer students suggestions on how to think about problems. They remind students of strategies they’ve learned and point out important information that encourages them to come up with their own solutions.

Teacher’s Guides include lesson plans, mathematical background, games, helpful suggestions, and comprehensive resources for daily lessons. Lessons are laid out clearly and activities are designed for the whole class, small groups, and extension.

**Textbooks and Workbooks do not include answer keys. Answers are in Teacher's Guides.**

**ISBN**9781947226340