Lesson 9

Escribamos números hasta 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

  • Contemos, escribamos y leamos números hasta 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


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?

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