• Unit Overview

  • Letter Home
  • Unit Preparation
  • Mathematics in this Unit
  • Assessment in this Unit
  • Key Assessment Opportunities Chart
• Daily Practice and Problems
• Home Practice

• Lesson 1

  • Part 1: Number Sentences for Tile Designs
  • Part 2: Use Symbols to Compare Number Sentences
  • Part 3: Create Individual Tile Designs
  • Summarizing the Lesson
  • Homework and Practice
  • Extension
  • Answer Keys

• Lesson 2

  • Developing the Lesson
  • Summarizing the Lesson
  • Homework and Practice
  • Answer Keys

• Lesson 3

  • Part 1: Solving Word Problems
  • Part 2: Writing Word Problems
  • Summarizing the Lesson
  • Homework and Practice
  • Answer Keys

• Lesson 4

  • Developing the Lesson
  • Summarizing the Lesson
  • Homework and Practice
  • Answer Keys

• Lesson 5

  • Part 1: Patterns on the 200 Chart
  • Part 2: Building 100 and 200
  • Summarizing the Lesson
  • Homework and Practice
  • Answer Keys

• Lesson 6

  • Part 1: Moving on the 200 Chart
  • Part 2: Addition and Subtraction on the 200 Chart
  • Summarizing the Lesson
  • Homework and Practice
  • Answer Keys

• Lesson 7

  • Part 1: Compare the 200 Chart and the Number Line
  • Part 2: Moving on the Number Line Game
  • Summarizing the Lesson
  • Homework and Practice
  • Answer Keys

• Lesson 8

  • Part 1: Many Ways to Solve a Problem
  • Part 2: Solving Problems Two Ways to Check for Reasonableness
  • Summarizing the Lesson
  • Homework and Practice
  • Answer Keys

• Lesson 9

  • Developing the Lesson
  • Summarizing the Lesson
  • Homework and Practice
  • Extension
  • Answer Keys

Lesson 3

Explore Subtraction Word Problems

Est. Class Sessions: 2

Daily Practice and Problems

X

Teacher Notes

X

Use DPP item H to practice addition facts, strategies and determining the unknown number in an addition or subtraction sentence relating three whole numbers for the facts in Group D.

1. 3 + 4 =  7
2. 7 + 6 = 13
3.  9 = 4 + 5
4. 3 +  6 = 9
5. 7 +  8 = 15
6. 14 = 7 + 7
7. 16 = 8 + 8
8.  3 + 3 = 6
9. Possible response: I know 7 + 7 = 14 so I need to add one more to reach 15. So 7 + 8 = 15.

H. Add It Up

Use connecting cubes, number lines, and ten frames.

1. 3 + 4 =
2. 7 + 6 =
3. = 4 + 5
4. 3 + = 9
5. 7 + = 15
6. = 7 + 7
7. = 8 + 8
8. + 3 = 6

9. Explain how you found the answer to Question E.