The Hundred Cell Calculation Method is a teaching method used across Japan to help students learn fundamental arithmetic calculations. It's a very simple learning method which involves adding, subtracting or multiplying the numbers along the sides of a 10 x 10 grid and placing those answers in each of the 100 cells that make up that grid.
This is an example of a Multiplication exercise in a 10 x 10 grid. Your goal is to multiply the numbers on the left with the numbers at the top and then note down the answer on the Touch Screen. In this case, 8 x 2 = 16 is the correct answer.
