Block-of-1000SKU for classic (all green): 040 0122 SKU for power (multi color): 040 0122 C The Block of 1000 is great for learning to count, add, subtract, multiply, and divide. It works great on its own, but if you want to really work on connecting the physical operations to how they are written, we recommend you also get 3 Place Counter. No other blocks work like Digi Block: Our blocks pack and unpack, meaning kids can start using the blocks without having to