Today has been Herr C.F. Gauss’ birthday, in 1777, in Germany. He is famous for his mathematical genius and insights on scientific method.
Rhinos do not excel at mathematics, but don’t usually need to. We can only count to three, and happily shove the numbers around. Whatever the outcome, We are equally content. We understand it is not every Critter’s system, but for Us it has worked a Long Time.
The difference between Addition and Subtraction is primarily spelling, if you ask Us.