This is an activity to review finding the volume of cones. Each row has two different problems that have the same answer. This can be used 2 different ways in class. First, you can give this as a partner practice. One partner works the problems in the left column, while the other partner works the problems in the right column. They can check each other as they work because their answers should match up across each row. If the answers don't match, the students perform error analysis to see where the mistake was made. Second, this can be given to students to complete individually. They can work the problems in each row and check themselves.