The math drill program runs in 320x240 256-color mode. For a problem set, there is a fixed background image over which large digit sprites are animated. For the initial version, there will be one background and one set of sprites. In future versions there may be multiple sets of graphics to enhance interest. The target animation frame rate is 70 Hz on a 33 MHz 486.
Animation occurs primarily in the transitions, when problems enter and exit the screen.
A good entrance would be for each of the digits to slide into position after entering from the side of the screen. Problem exits are only used after correct answers. They should probably be in the 2-3 second range. The digits jump one by one, then fall off the screen. The digits explode off the screen in all directions.