Movable x- and y-axes and built-in factor tracks help children explore area models and multiplication strategies. Tray has a write-on/wipe-off surface to use as a workspace. Includes 1 Base Ten Area Model Tray, 1 set of Base Ten Blocks including 20 rods, 4 flats, and 100 units, 1 dry-erase marker, and an activity guide.