Goofus makes mistakes in math and it's up to your students to help him find those mistakes and solve the problems correctly. Kids are excellent at pointing out everybody else's mistakes. Take your students to a new level of critical thinking and analyzing for errors. This pack contains calculating perimeter, finding the measure of the missing side, calculating area of rectangles and squares, and calculating area of irregular figures. These are perfect bell ringers, warm-ups, exit tickets, center activities, homework, or morning work. Your students will fall in love with Goofus, but more importantly they'll have to use math to help him solve his problems and find his mistakes!