• 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: Revisiting the Subtraction Strategies Menu for the Facts
  • Part 2: Introduce the Triangle Flash Cards for Subtraction
  • Summarizing the Lesson
  • Homework and Practice
  • Answer Keys

• Lesson 2

  • Part 1: Develop Strategies for Subtraction Problems
  • Part 2: Emphasize Different Subtraction Strategies
  • Summarizing the Lesson
  • Homework and Practice
  • Answer Keys

• Lesson 3

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

• Lesson 4

  • Part 1: Subtraction Problems with No Trades
  • Part 2: Subtraction Problems with Trades
  • Summarizing the Lesson
  • Homework and Practice
  • Answer Keys

• Lesson 5

  • Part 1: Connect Base-Ten Pieces to Expanded Form
  • Part 2: Check Subtraction with Addition
  • Summarizing the Lesson
  • Homework and Practice
  • Answer Keys

• Lesson 6

  • Part 1: Recording Subtraction on the Base-Ten Recording Sheet
  • Part 2: Checking for Reasonableness
  • Summarizing the Lesson
  • Homework and Practice
  • Answer Keys

• Lesson 7

  • Part 1: Making Connections Between Strategies
  • Part 2: Common Mistakes in Subtracting
  • Part 3: Introducing the Subtraction Strategies Menu
  • Summarizing the Lesson
  • Homework and Practice
  • Answer Keys

• Lesson 8

  • Before the Lesson
  • Part 1: Explore Subtraction Strategies
  • Part 2: Practicing Subtraction Strategies
  • Part 3: Difference War
  • Summarizing the Lesson
  • Homework and Practice
  • Answer Keys

• Lesson 9

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

Lesson 8

Workshop: Subtraction Practice

Est. Class Sessions: 2

Daily Practice and Problems

X

Teacher Notes

X

Have student share solutions strategies.

1. $73;24 = 20 + 4
   + 49 = 40 + 9
   60 + 13 = 73
   
2. Yes; Carla will have $23 left; 37 + 15= 52 spent. 75 − 52 = 23. I thought about money. I subtracted 50 from 75 and then subtracted 2 more.
3. $17; I counted up on the number line from 39 to 40 then made one hop of 10 to 50 then added 6 more; 1 + 10 + 6 = 17.

DD. At the Toy Store

Tell your neighbor how you solved each problem.

1. Richard bought a helmet and a scooter. How much did he spend?
2. Carla had $75. Can she buy roller skates and a skate board? Will she have any money left? If so, how much?
3. Luis has $39. He wants to buy a remote control car. How much more money does he need?