Lesson objective: Decompose numbers less than or equal to 10 into pairs in more than one way.

This lesson helps to build procedural skills with decomposing numbers. Modeling with two-sided counters is used here because it supports students as they build a visual representation of decomposition. This work develops students' understanding that a total can be taken apart into more than one pair of addends.

Students engage in Mathematical Practice 6 (Attend to precision) as they count the objects in each part and recognize that the total stays the same even though the parts change.

**Key vocabulary:**

- decompose
- parts
- total

**Special materials needed:**

- cups
- recording sheet (optional)
- two-sided counters