Addition and subtraction change diagrams directly address the standard 2.OA.A.1 – problem solving for unknowns. The three unknowns addressed in this activity are start unknown, change unknown, and result unknown.
There are practice problems for each of the unknowns that can be done whole group before completing the scavenger hunt. Simply project the problems onto your Smart Board/Promethean board or print out the pages to use under a document camera.
After completing the practice problems, print out each card and hang them around the room in random order. It is fun to hang them on the sides of desks, on the library bookshelf, etc.… Students may partner up or independently go around the room finding problems, solving them, and writing the answers in the diagrams on the recording form. Students LOVE this activity!
Included are two sets of scavenger hunt cards. The first set includes easier problems and the second set is a bit more difficult. There are 12 cards in each set.