Use this versatile tool and Unifix Cubes to model and understand number concepts base ten and operations through 100. Comprehensive teacher s guide includes illustrated activities for number relationships addition subtraction multiplication and division. Base is 3 x 9 inches with 10 positions and includes 22 number label cards (10s 20s 30s 40s 50s) and 100-grid card to position behind stacks of cubes. Unifix Cubes are sold separately.