Kageyama Method

Study Alone

Choose this method if you want to tackle the 100-Cell Math and Division Marathon exercises by yourself.

Study Together

If you want to practice with up to 15 of your friends, family, or classmates, choose this multiplayer mode!

Nintendo DS
DS Screen

100-Cell Math

The 100-Cell Math approach is a technique used to help students learn fundamental arithmetic. It involves adding, subtracting, or multiplying numbers along the sides and top of a 10x10 grid and writing their answers in corresponding boxes with the Nintendo DS stylus. Start with only 10 cells, and gradually move up to 30, 50, and all 100 cells. In Personal Trainer: Math, this is just one fun and fast-paced lesson to tackle when you select Kageyama Method on the main menu.

Division Marathon

This exercise challenges you with a series of division problems presented one after the other. Write the answer to each problem on the touch screen, and if your answer is correct, you'll move on to the next one. Choose Type A, B, or C for Easy, Normal, or Hard problems respectively. The Easy division problems have no remainder, while Normal problems have a reminder but don't require borrowing to work out the remainder. In Hard mode, the division problems will require borrowing numbers to work out the remainder. The problems may seem easy, but try to finish 30 division problems in under 48 seconds and see how you do – and that's just an Easy exercise!

Boy Enjoying Math On The DS
Professor Kageyama

Meet Professor Kageyama

Hideo Kageyama is a real-life Professor at the Center for Research and Educational Development in Higher Education at Ritsumeikan University in Kyoto, Japan. He is also the deputy headmaster of Ritsumeikan Primary School and a member of the Central Education Council of the Japanese Ministry of Education.

I was wracking my brains over how to get people to practice the 100-Cell Math method in an easy-to-use and effective way when I discovered the Nintendo DS™. Immediately, I knew that this was what I was looking for. It offered the possibility of self-assessment, saving and displaying one’s records, setting puzzle difficulties, and providing the fun that would motivate users to keep coming back.-Hideo Kageyama