• Unit Overview

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

• Lesson 1

  • Part 1: Strategies for Estimating Quantities
  • Part 2: Computational Estimation
  • Summarizing the Lesson
  • Homework and Practice
  • Answer Keys

• Lesson 2

  • Developing the Lesson
  • 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: Solving Addition Problems with No Trades
  • Part 2: Solving Addition Problems That Involve Trades
  • Summarizing the Lesson
  • Homework and Practice
  • Answer Keys

• Lesson 5

  • Part 1: The Expanded-Form Method
  • Part 2: The All-Partials Method
  • Summarizing the Lesson
  • Homework and Practice
  • Answer Keys

• Lesson 6

  • Part 1: Making Connections between Strategies
  • Part 2: The Compact Method
  • Summarizing the Lesson
  • Homework and Practice
  • Answer Keys

• Lesson 7

  • Before the Lesson
  • Part 1: Addition Strategies Practice
  • Part 2: Mental Math Games
  • Summarizing the Lesson
  • Homework and Practice
  • Answer Keys

• Lesson 8

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

Lesson 2

An Addition Seminar

Est. Class Sessions: 2–3

Daily Practice and Problems

X

Teacher Notes

X

Greg's; 10 cm
100 cm – 90 cm = 10 cm

E. Centimeters and Meters

Greg takes a large step. It measures 1 meter long.

Mary's step is 90 centimeters long.

Whose step is longer? _______________________________

How many centimeters longer? _______________________________