Cut pages in half and post the questions around the room. Students will start at any one of the questions, solve it and go to the next question that includes their answer. They will work their way around the room and should end up back at their starting point.
A recording sheet has been included that asks students to write the problem, the addition rule, show an illustration (either number line or charge model) and give the answer.
A full answer key is not included, however answers are in order in original documents and two examples are filled out on a sample recording sheet.