The calculation box has a small blackboard, allowing children to freely paint, fully exert their imagination and improve their sketching ability.
The kid can learn the computing power by knowing the numbers 1-100 through the numbers on the tiles.
It is also possible to count small wooden sticks and replace the traditional hand index numbers with colored wooden sticks.
On the back of the blackboard, a small mushroom analog clock is designed to let the child know the hour and minute hands and educate them about the weight of the time.