- Calculation of battle probabilities.Erf-b1-p054
- Making sophisticated predictions of the future (though it may be that Parson's bracer extends into Predictamancy to do this). Erf-b1.5-p039
As of yet, no known Mathamancers have been introduced.
The Plastic Gauntlet that Parson received in his second Stupid Meal is a powerful Mathamancy Artifact that runs off the power of his calculator watch.Erf-b1-p054
Sizemore estimates the worth of these two items at more than half a million shmuckers to a Mathamancy-dependent kingdom.
No character except Parson has demonstrated any non-trivial math or accounting. It could be that at least some of the powers of mathamancy are not extraordinary in our world.