Addition and subtraction within 20 is the focus of this tool designed for use with standard unifix cubes (sold separately). demonstrate addition problems by placing stacks of unifix cubes into the slots on each side and combining into one channel to see the results. Or, fill one side and move part of the cubes to the other channel to demonstrate subtraction. An engaging way to develop fact fluency to 20. Includes activity ideas.
tray measures 14 x 2 . Unifix cubes sold separately.
tray measures 14 x 2 . Unifix cubes sold separately.
