This is a lesson on addition that can be used as a review lesson or the last lesson in the unit on addition.

The lesson is divided into three parts:

• Engagement
• Exploration
• Elaboration

The lesson consists of an engagement activity to determine students' comfort levels with representing addition.

The exploration part involves students identifying patterns in addition by completing addition tables.

The elaboration part involves students determining different ways of using addition to represent one of the numbers they explored.

Key terms: models, addition