Lesson objective: Apply understanding of addition and subtraction and knowledge of using a variety of tools to solve problems and to create equations.

This lesson provides an opportunity for students to apply their understanding of the meaning of addition and subtraction to a real-life situation. Students are asked to examine pictorial solutions to addition and subtraction problems to create their own equations. The pictorial solutions will be done on a variety of familiar tools such as number lines, ten frames, snap cubes, or number bonds.

Key Concept students will use:

- The meaning of addition and subtractions do not change, no matter which tool you are using.

Skills students will use:

- Addition can be thought of as "putting together" and subtraction as "taking apart."
- Addition and subtraction problems can be solved using a variety of tools.
- Equations can be used to represent mathematical problems.

Students engage in Mathematical Practice #3 (Construct viable arguments and critique the reasoning of others) as they share equations they have created and discuss their reasoning for which equatioon is the best match to a pictorial solution.

**Key vocabulary: **

- tool
- addition
- subtraction
- equation