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?