Lesson objective: Understand addition as putting together.

Students bring prior knowledge of addition from K.OA.A.1. This prior knowledge is extended to numbers up through 10 as students compose numbers using pairs of addends. A conceptual challenge students may encounter is incorrectly counting the number of objects.

The concept is developed through work with manipulatives, such as counters, which help students develop one-to-one correspondence as they count objects.

This work helps students deepen their understanding of equivalence because students develop an understanding that there are different ways to make the same number.

Students engage in Mathematical Practice 4 (Model with mathematics) as they show different combinations to make the number six.

**Key vocabulary:**

- addition
- compose
- number
- part
- total

**Special materials needed:**

- manipulatives, such as counters