Set students up in a circular fashion facing one another. Students will pair up with another student. (CARD A AND CARD B) they will then solve their problem and become an expert at solving that particular problem. Card B students rotate clockwise with exchanging their original problem with the student across from them. They will solve their partners problem. (2 minutes is usually what I give- adjust if necessary) When the timer goes off they will check their partners work and tutor right then and there if necessary. They will then get their original problem back and rotate again. You will need to make sure you run the answers on the backside if you would like to have the cards with the answers on the back to speed up the process.