This is a zipped file consisting of three files: an 8 slide powerpoint, a 2 page word document, and a 1 page jpeg picture.
Print out the 8 slides that have two problems each and cut them apart. Tape them up randomly around the room.
I've used these in two different ways:
1) Write the answers to #1 on the back of #2 and the answer to #2 on the back of #3 and so on until you write the answer to #16 on the back of #1. Students complete the problem and then move to the next problem to flip the paper up and check their answer and then do the new problem. Make sure students aren't just moving around and copying the answers.
2) Have students work their way around the room completing each problem and showing their work in the boxes on the answer sheet. At the end, have them write their final answers on the line, cut off the bottom half and turn it in so you can check the answers.
Also, differentiate by starting your top students closer to the end and your lower students closer to the beginning (the problems get harder as they go). The fast students can work on their own while you help the slower ones.