Activity: Problem 1 and Problem 2  
Source 

Description 
A page with the works "Problem 1 Start" is placed in one corner of the room; at some other point in the room a page with the words "Problem 1 Finish" is placed on the ground. A volunteer from class is asked to go to the "Problem 1 Start" page, and then to finish the problem. The student walks to the "Problem 1 Finish" page, and gets a short round of applause for finishing the problem.
A second student is asked to complete problem 1. The student takes a different path (knowingly or unknowingly, even if I have to get in their way so they choose a different path.) Student two finishes the problem, gets a short round of applause, and I thank both for their efforts. Short class discussion about how both students solved the problem; they took different paths to solve the problem but they got to the same finish. Maybe one was a more direct approach, maybe one is more creative (clownish is fine too); Next comes problem two. A page marked "Problem 2 Start" is placed on the floor; a third volunteer is selected. They watch me pick up the "Problem 1 Start" and "Problem 1 Finish" pages, and they are asked to finish problem 2. They have no way of knowing that I had hung the "Problem 2 Finish" page on the bulletin board near the Math/Science office. I ask them to finish problem 2; we discuss what happens;

Materials 

Standards for Mathematical Practice 
