かけざん脳トレ

Train your calculation skills and brain power while having fun learning 2-digit x 2-digit multiplication!
Calculations like 98×94 can be solved in an instant if you get the hang of it.

While having fun like a game, train your mental arithmetic skills and acquire calculation skills that you can use in your daily life and work!

You can study effectively even in a short period of time, so you can quickly take up the challenge in your spare time.
Why not take on the challenge to become a master of calculations?