• Tray measures 14 ½” x 2 ½”.

Promotes Fluency in Addition and Subtraction within 20. Addition and subtraction within 20 is the focus of this tool — designed for use with standard Unifix® cubes. Demonstrate addition problems by filling the slots on each side and combining into one channel to see the results. Or, fill one side and move cubes to the other channel to demonstrate subtraction. An engaging way to develop fact fluency to 20. Includes activity ideas.