No ono je to preto, lebo pre nich 20 je 'score' a to je vyznamna hodnota, lebo umoznovala sedlakom pocitat prstami. Tymto sposobom boli schopny napocitat do 399 :)

Okrem toho sa na to pouzivali aj zarezy na palici : The connecting notion probably is counting large numbers (of sheep, etc.) with a notch (a scoru) in a stick for each 20. That way of counting, called vigesimalism, also exists in French.