# Lesson 1

Contemos y sumemos

### Lesson Purpose

The purpose of this lesson is for students to count objects and relate counting to addition.

### Lesson Narrative

Students revisit counting collections, which is an activity introduced in kindergarten. Students count and represent objects in a way that makes sense to them. Students then count dots on two dot cubes to find the total. Together, they relate counting to addition, as the teacher writes expressions to represent the total number of dots on the two cubes (MP2). A 10-frame is provided as a blackline master. Students used 10-frames in kindergarten and may choose to use them throughout this section. Consider making copies on cardstock or laminating them so they can be used repeatedly.

Throughout the lesson, observe students for the look fors on the Section A Checkpoint Assessment, which can be used throughout the section.

### Math Community

In the lesson synthesis, students discuss what it means to be a part of a mathematical community. Prepare a space, such as a piece of poster paper, titled *“Comunidad matemática” //* “Math Community” and a T-chart with the header *“Hacer matemáticas” //* “Doing Math.” Partition the column into two sections: students and teacher.

- Engagement

- MLR8

### Learning Goals

Teacher Facing

- Count and represent a collection of objects.
- Relate counting to addition.

### Student Facing

- Contemos objetos.

### Required Materials

Materials to Gather

Materials to Copy

- Counting Collections Stages 1 and 2 Recording Sheet, Spanish
- 10-Frame Standard
- Number Race Stage 3 Gameboard

### Required Preparation

Activity 1:

- Create one collection of up to 20 objects such as buttons, counters, connecting cubes, paper clips, square tiles for each group of 2.

### Lesson Timeline

Warm-up | 10 min |

Activity 1 | 20 min |

Activity 2 | 20 min |

Lesson Synthesis | 10 min |

Cool-down | 0 min |