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 the 10-frames so they can be used repeatedly.

Math Community 
In the Lesson Synthesis, students discuss what it means to be a part of a mathematical community. Prepare a Math Community poster by drawing a two-column chart as shown. Note that there are sections for students and the teacher to emphasize that both parties are responsible for the way math is done in the classroom. In this lesson, students will add their ideas to the “Doing Math”​ column. In upcoming lessons, students will add to and revise their contributions, including drafting classroom goals and expectations for the “Norms” column. Keep the poster displayed in the classroom throughout the year.

Reflect on the tone in the classroom during the first lesson of the year. How are you feeling about teaching math, and how are your students feeling about participating in the mathematics this year? How can you tell?