Use this great visual aid for the demonstration of number concepts on the whiteboard! Teachers and students will engage in base ten, operation skills and other number skills as a group or in a center activity. Promotes composing and decomposing numbers, develops numbers sense and base-ten concepts, and operations skills (addition and subtraction). Set includes 2 magnetic foam Ten-Frames and 20 disks (10 each of red and yellow). Foam makes it easy to remove pieces from white board. Each Ten-Frame measures 5" x 12-1/4".