English: Arithmetic or arithmetics (from the Greek word ἀριθμός, arithmos "number") is the oldest and most elementary branch of mathematics, used by almost everyone, for tasks ranging from simple day-to-day counting to advanced science and business calculations.
- Filippo Calandri. Trattato di Arithmetica. Florence 1491-92
- See also Trattato di arithmetica
- See also Abacus