Different cultures developed number systems with different bases. English counts in base 10 (decimal), but traces of other systems remain: 'dozen' (12) and 'score' (20) reflect base 12 and base 20 systems. French uses a base 20 system for numbers 60-99 (quatre-vingts = four twenties = 80). Many indigenous languages use base 5, 8, or 20 number systems reflecting different ways of counting on fingers, toes, or body parts.