Lesson objective: Decompose the single-digit number to make a new group ten when adding.

This lesson helps to build procedural fluency with using equations to compose a new ten. Ten frames are used here to help with the transition to equations because they highlight how many more ones are needed to make a ten. Students can use this information to inform the equation they use to show making a new ten. ** **This work develops students' understanding that when adding two-digit numbers, sometimes it is necessary to compose a new ten.

Students engage in Mathematical Practice 6 (Attend to precision) as they decompose and compose numbers. Students are precise in using equations to represent their problem solving steps.

**Key vocabulary:**

- decompose
- equation
- model
- ones
- tens
- ten frame

**Special materials needed:**

- ten frames
- base ten blocks or unifix cubes