ver wonder how the calculator seems to know the numeric value of ? How could it possibly know? is an Irrational Number which means its decimals don’t repeat! (Specifically is a Transcendental Number but it falls under the category of an irrational number). So how can you fit an infinitely large number in a small box? Or for that matter, how did Leonhard Euler manage to calculate to 23 decimal places **without** a calculator?