• 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

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

• Lesson 2

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

• Lesson 3

  • Part 1: Rounding Numbers Using Benchmarks
  • Part 2: Strategies for Computational Estimation
  • Summarizing the Lesson
  • Homework and Practice
  • Answer Keys

• Lesson 4

  • Part 1: Adding with Base-Ten Pieces
  • Part 2: Adding with Mental Math Strategies
  • Part 3: Build Foundation for Paper and Pencil with Base-Ten Pieces
  • Part 4: Two Paper-and-Pencil Methods
  • Part 5: Refine Collection of Addition Strategies
  • Summarizing the Lesson
  • Homework and Practice
  • Answer Keys

• Lesson 5

  • Part 1: Reviewing Addition Strategies
  • Part 2: Using Base-Ten Pieces to Add
  • Part 3: Review Two Paper-and-Pencil Addition Methods
  • Part 4: Digits Game
  • Summarizing the Lesson
  • Homework and Practice
  • Answer Keys

• Lesson 6

  • Before the Lesson
  • Part 1: Palindromes and Addition
  • Part 2: Addition Practice
  • Summarizing the Lesson
  • Homework and Practice
  • Extension
  • Answer Keys

Lesson 2

The Coat of Many Bits

Est. Class Sessions: 3

Daily Practice and Problems

X

Teacher Notes

X

TIMS Bit

Approximately 24 sq cm

The right side has an area of about 12 sq cm. The left side has the same area.

12 + 12 = 24 sq cm

E. Use Symmetry

Tara tried to find the area of the shape below using symmetry. The dotted line shows how she folded the shape. Tara got confused and could not finish. Use symmetry to find the area of the entire shape.

Explain your thinking.