the.com/arithmetic
The math you swore you'd never use, then spent your whole life using.
means The branch of mathematics dealing with numbers and the basic operations of adding, subtracting, multiplying, and dividing them.
from From Greek arithmos, number — the same root that gave us arithmancy, the ancient art of divining fate from digits.
Stress shiftAdjective arithMETic stresses a different syllable entirely.
Older than writingTally marks predate the alphabet by millennia.
Modular twistClocks use it: 11 plus 2 equals 1.