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 with 10 positions and includes 22 number label cards 10s 20s 30s 40s 50s and 100 grid card to position behind stacks of cubes Features . Unifix Cubes Hundred Base Specifications . Weight 3 35 lbs