Lesson 9

Write Numbers to 120

Lesson Purpose

The purpose of this lesson is to count, read, and write numbers up to 120 in a measurement context.

Lesson Narrative

In previous lessons, students learned how to count up to 110 objects and connected written numbers to quantities.

In this lesson, students measure a length between 95 and 120 length units long and represent their count using numbers. Then, students create a poster to show a drawing of their count, without including the written number. When students participate in a gallery walk to view each poster, they record the numbers represented.

  • Representation
  • MLR2

Learning Goals

Teacher Facing

  • Measure length and determine an efficient way to count the number of length units up to 120.
  • Read and write numbers to 120.

Student Facing

  • Let’s count, write, and read numbers up to 120.

Required Preparation

Activity 1:

  • Put strips of tape on the floor, 2–3 of each length. Label with the animal name. There should be one length of tape for each group of 3.
    • Beaver: 95 centimeters
    • Snake: 105 centimeters
    • Giant Anteater: 120 centimeters
    • Dog: 110 centimeters
    • Raccoon: 100 centimeters
    • Red Fox: 115 centimeters
  • Make bags or buckets of about 125 base-ten cubes per group of 3.

CCSS Standards

Addressing

Lesson Timeline

Warm-up 10 min
Activity 1 15 min
Activity 2 20 min
Lesson Synthesis 10 min
Cool-down 5 min

Teacher Reflection Questions

What connections did students make between towers of ten and singles or base-ten diagrams and the written numbers up to 120? What questions did you ask to help make the connections more visible?

Print Formatted Materials

For access, consult one of our IM Certified Partners.

Additional Resources

Google Slides

For access, consult one of our IM Certified Partners.

PowerPoint Slides

For access, consult one of our IM Certified Partners.