Our website provides a free download of MATRIS 4.11.0515. The following versions: 4.1, 3.1 and 1.3 are the most frequently downloaded ones by the program users. The actual developer of the software is Jutta Behling. Commonly, this program's installer has the following filenames: ACC.exe and matris.exe etc. The program lies within Education Tools, more precisely Science Tools.
From the developer:
MaTris lets your child practice basic arithmetic. Exercises include counting symbols, addition, subtraction, division, and multiplication. A wizard lets you adjust the duration and content of each session, and it lets you set up a log file to track results. As each question is answered correctly, a spider drops down a wall.
You may want to check out more software, such as Trachtenberg Speed Math, MathMatic or ChemDBsoft Lite Demo, which might be related to MATRIS.