DCI Pop Quiz Clock, Black and White, Metal, 11-1/2" Diameter, Mathematics Teacher Gift, Wall Clock for Classroom, Home, Office Analog display wall clock made of matte black powder coated metal with white letters and numbers, great for classrooms or the office As the clock ticks, the hands move around the dial indicating the time of day through a different math problem for each hour A unique and creative way to keep track of time, this wall clock is a fun and challenging brain exercise. Solve it and you might solve the riddle of time! Large clock with a 11-1/2 diameter, powered by 1 AA battery (not included) The perfect gift for teachers and students, engineers and accountants or anyone who works with numbers