This self checking worksheet tackles the difficult concept of 'at least' and 'at most' problems. My students were struggling with this concept, so I made a puzzle to help them out. (They will happily do a worksheet, but motivation is a factor when I assign problems from the book. My students are spoiled, I realize.) I have put in the equations to help the teacher as well. When finished, the students will discover the authors to some books never written.