UNIT PREPARATION

Display the class number line (0–130) where students can see and reach it with a pointer.

Attach a desk number line (0–40) to each student's desk to use throughout the year.

Display the Math Practices page where all students can see it.

Attach copies of the Desk-Size 100 Chart to students' desks or folders to use throughout the year in class and at home. See the Unit 9 Lesson 7 Materials Preparation.

Copy the Ten Frames and Number Line Master and the 100 Chart Master back-to-back for easy access to these tools during class and at home. See the Unit 12 Lesson 1 Materials Preparation.

Display the Comparison Symbol Chart from Unit 8 Lesson 5.

Have the following tools readily available for the Daily Practice and Problems items in this unit.
LESSON SESSIONS DESCRIPTION SUPPLIES

LESSON 1

A Three Hat
Day

 1 After hearing the story A Three Hat Day by Laura Geringer, students find the possible number of combinations if three different hats were worn simultaneously in a different order each day.
  • A Three Hat Day by Laura Geringer
  • connecting cubes in three colors
  • crayons or colored pencils
  • chart paper

LESSON 2

Collect Pet
Data

 2–3 In this lab, students contribute to a class set of data. Students collect, organize, and graph the data, detailing the kinds of pets students have. The TIMS Laboratory Method provides the structure for this lesson.
  • 3-inch square
    self-adhesive notes or construction paper squares
    and tape
  • connecting cubes
  • number lines
  • chart paper

LESSON 3

Use Problem-Solving
Strategies

 2 Students use intervals to estimate answers to problems and continue to identify and use a variety of tools and strategies to solve problems. Students think about how they can modify the strategies they learned for solving problems with small numbers to solve problems with larger numbers.
  • connecting cubes
  • number lines
  • chart paper

LESSON 4

Patterns in
Addition and
Subtraction

 2–3 Students describe strategies used to solve addition and subtraction problems with larger numbers. Students skip count and use the 100 Chart and Rule Machine to look for patterns in addition and subtraction problems.
  • connecting cubes
  • number lines
  • dimes, nickels, and pennies
  • chat paper

LESSON 5

Model
Repeated
Addition and
Subtraction

 2–3 Students solve problems from stories and drawings involving multiplication and division concepts with repeated addition and subtraction strategies.
  • crayons
  • 9 x 12–in. white or light-colored construction paper
  • number lines
  • connecting cubes

LESSON 6

Solve
Repeated
Addition and
Subtraction
Problems

 2 Students use drawings and invent strategies for solving word problems that involve repeated addition and repeated subtraction situations. They then write their own word problems.
  • connecting cubes
  • number line

x

x

Essential Titles

  • Geringer, Laura. A Three Hat Day. Harper Collins Publishers, New York, 1985.