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

Materials: - Whiteboard - 2 Dry Erase Markers - Classroom Computers (Optional)

Instructions: 1. Begin the lesson by writing the following learning intention on the board: “Students will be able to add two digit numbers within twenty.”

1. Model an example of two digit number addition. Use two digit numbers that total below 20.

2. Ask students to solve the example. Participate in a whole class discussion about the problem. Ask students to explain the process used to solve it.

3. Give each student two digit numbers within 20 to add together. Allow the students a few minutes to work the problem out on their own.

4. Have each student share their results with the class. Ask clarifying questions if needed.

5. If helpful, provide additional support by introducing rules or shortcuts for two digit addition.

6. Utilize the classroom computers to create an online game that demonstrates two digit addition.

7. Ask students to play the game and show their understanding of two digit addition by competing against each other.

8. Conclude the lesson by having students turn and talk to a classmate, explaining the process and any rules or shortcuts they have learned.