Ancient Calculators · Four notation systems
Try ancient calculation systems
Solve the same multiplication in four notation systems and feel why Hindu-Arabic numerals changed the world.
Problem
287 × 13 = ?
The problem in Roman numerals
CCLXXXVII × XIII = ?
(The same problem in Hindu-Arabic numerals: 287 × 13)
💡 Roman numerals have no place value, which makes multiplication extremely difficult. Try it with pencil and paper—the difficulty is intentional.