Are you teaching the commutative property of addition? These 3 part puzzles would make a nice addition to your math learning centers. There are 32 puzzles using 1 and 2 digit numbers addition problems to demonstrate the commutative property. Print the puzzles, laminate and cut apart. Then print the puzzles again and leave as is to use as an "answer" key so students can check to see if they put the puzzle together correctly.