Matho-Sub Cost: $9 Get the full version     Trial version     Developer's Website Contacting third-party download site please wait. If your download does not start, click here, or get the full version Descriptions Matho-Sub: The objective of this software is to improve Mental Subtraction. After a regular practice on Subtraction software your kid's calculation speed should increase 10 to 15 times. MATHO-Sub software has been divided in three levels viz. Beginner, Medium & Expert. In each level you would find three speeds viz. slow, medium & fast. You can even vary the motion of the falling numbers in two ways viz. top to bottom & random..