Students develop fluency with addition and subtraction within 10 in grade 1. This lesson provides an opportunity for formative assessment of students’ fluency within 10, including recognizing sums with a value of 10. Throughout the lesson, monitor for the ways students find the values of sums and differences and how they describe their methods to others. There may be sums and differences students say they “just know.” In this case, do not require students to explain how they got their answer every time, and take note of the expressions that many students already know from memory. Counters or connecting cubes should be made available for students to use, encourage students to use them only if they need them.

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 add their ideas to the “Doing Math”​ column. In upcoming lessons, students will add to and revise these ideas, including drafting classroom goals and expectations for the “Norms” column. Keep the poster displayed in the classroom.

What do you love most about math? How are you sharing that joy with your students and encouraging them to think about what they love about math?