# 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 Materials

Materials to Gather

### 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.

### 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?