Sell Nintendo DS Games. Get Cash for Professor Kageyamas Maths Training. One of the best ways to sharpen your basic maths skills is through repetition, and Professor Kageyama's Maths Training: The Hundred Cell Calculation Method gives you the opportunity to do maths exercises in a new, fun way! Renowned Japanese Professor Hideo Kageyama designed the Hundred Cell method to improve children's school performances. In his method, Professor Kageyama takes a 10-by-10 cell grid and places a single-digit number in front of each row and column. A person filling in the grid solves each cell by calculating the numbers listed at the start of the row and column. The key to the Hundred Cell method is to fill in each cell as fast as possible. The calculation itself may be simple, but the challenge comes in finishing faster each time you fill in a grid. It's this repetition that sharpens your maths skills! Like other mental fitness software in the Touch! Generations series, Professor Kageyama's Maths Training sports a daily training mode with recommended exercises. After training for five days, your level increases and along with it the difficulty level. In addition to the Hundred Cell calculations and daily training, Professor Kageyama's Maths Training features 40 additional exercises based on simple maths skills. After finishing an exercise, you're awarded a medal based on your performance. With the Hundred Cell method, you can refresh your basic maths skills for school or everyday life! * Challenge up to 15 fiends to a fun, cell-solving multiplayer contest. All you need is one Game Card to match maths skills against family members or schoolmates. * The game continues to challenge your skills through daily training. As your level of competency improves, the difficulty increases. * Excellent Touch Screen handwriting recognition helps the software register your answer quickly. You hold the DS like you would a book, which makes using the software feel more like you're writing on a tablet.