Learning Intention: Students will be able to add two digit numbers within 20 accurately.

Materials Needed: Whiteboard, dry eraser, dry erase markers

Lesson:

1. (Introduction): Ask students what they know about adding two digit numbers within 20. What strategies do they already use? (Allow for student input).

2. (Modeling): Model how to solve an example two digit addition problem with students. Write the example on the whiteboard.

3. (Guided Practice): Ask students to come up to the whiteboard and solve the problem with you. Once they have solved the problem, ask the student to explain their strategy to the rest of the class.

4. (Independent Practice): Hand out math worksheets containing two digit addition problems within 20 and ask students to complete them.

5. (Assessment): Collect the worksheets and assess student understanding of the material.