This interactive activity is perfect for introducing or reviewing the commutative and identity properties of addition. Students can follow along with a student printable sort sheet while the teacher uses larger sized sort cards that can be printed on colored paper, and laminated for durability. Add magnets to the backs of the cards to make the activity interactive so students can take turns dragging and sorting the number sentences to the correct category. Student sheet can be collected as a formative or summative assessment. Students even CREATE their own problems using the sheet as well!