This giant open number line features colorful beads and a write-on/wipe-off surface and measures 22 feet when completely assembled. Beads alternate between green and white in groups of five. This is a great classroom resource for teaching one-to-one correspondence, counting, addition, subtraction, place value and more. The set includes six sheets (44" x 7" each) featuring 20 beads each. Use just the sections you need or put them altogether for activities to 120 that you can see from across the room.