In this activity students create a 12 sided ball that has 12 questions and 12 answers. The students come up with their own questions and answers and then assemble the ball. The students can then review with their friends by rolling the ball. The question they need to answer is on the top and they can they lift the ball to find the answer on the bottom.
Alternative idea: the teacher can write the questions and/or answers on the ball before copying it for the students.
This makes a PERFECT emergency lesson that can be used for any subject and for any unit.