# Lesson 7

Contemos colecciones grandes

### Lesson Purpose

The purpose of this lesson is for students to organize, count, and represent a collection of up to 120 objects or images using place value understanding.

### Lesson Narrative

In previous units, students counted a collection of up to 120 objects and wrote and read numbers in that range. Students recognized 10 tens as 100, but have not been introduced to the unit of a hundred.

In this lesson, students revisit counting large groups of objects or images and represent their count in different ways. With both objects and images, students consider how organizing into groups of ten is helpful.

If students need additional support with the concepts in this lesson, refer back to Unit 6, Section B in the curriculum materials.

• Representation
• MLR7

### Learning Goals

Teacher Facing

• Count to 120, starting at a number other than 1.
• Organize, count, and represent a collection of up to 120 objects or images.

### Student Facing

• Organicemos, contemos y representemos colecciones grandes.

### Required Materials

Materials to Gather

### Required Preparation

Activity 1:

• Prepare a chart with these start and stop numbers:

Start

Stop

$$\phantom {0}67\\ \phantom {0}85\\ \phantom {0}90\\ 100$$

$$\phantom {0}80\\ \phantom {0}95\\ 105\\ 120$$

Activity 2:

• Create collections of between 90 and 120 objects, such as connecting cubes, counters, centimeter cubes, paper clips, pattern blocks, or other objects, for each group of 2 students.

### Lesson Timeline

 Warm-up 10 min Activity 1 15 min Activity 2 15 min Activity 3 10 min Lesson Synthesis 10 min Cool-down 0 min

### Teacher Reflection Questions

As students worked today, whose ideas were heard, valued, and accepted? How can you make adjustments for tomorrow to ensure each student’s ideas are a part of the collective learning?