arithmetic numbers are, incrementally, 0 1 2 3 4 5 6 7 8 9 . 0 is nothing. 1 is a single item. after nine are represented in base ten such that after 9 is 10 and 100 is incrementing to 10, 10 times over.
operations are addition (+), subtraction (-), multiplication (* or x), and division (/) [more exist]
