Easily demonstrate base-ten number concepts on the whiteboard! Giant magnetic Ten-Frames and colorful discs allow students and teachers to engage with base ten and other number and operations skills (addition and subtraction) as a group. Set includes 4 magnetic frames, 40 discs (20 green, 20 blue) and Instruction Guide. Frames measure 12.25" L x 5" H. Grades K and up. Ages 5-8.