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

This lesson provides an opportunity for students to apply their knowledge and understanding of subtraction to a real-life situation. Students are asked to find different ways that seven cookies can be put onto two plates.

Key Concept students will use:

- A total can be taken apart into more than one pair of addends.

Skills students will use:

- Adding numbers to 10
- Subtracting numbers to 10
- Counting up to 10 objects (Kindergarten, Unit 2)

Students engage in Mathematical Practice 3 (Construct viable arguments and critique the reasoning of others) as they explain why they agree or disagree that there are eight ways to take apart the number seven.

**Key vocabulary: **

- addition
- decompose
- subtraction

**Special materials needed:**

- manipulatives, such as counters