How Do You Know if You Understand One, Two, Three?

There is something caled ten approximate number system, which gives people a general sense of relative quantity. It's not something that comes easily to kids or adults in traditional societies. A if you don't have that much experience, then the folk, intuitive stuff kind of dominit i was reading an article in the australian,. which is one of our newspapers here, er by michael brooks. He describes the piraha identify, say, they ie people of the amazon who only have a concept of numbers of one, two, three or more. Soehe he talks of lining batteries up on the ground in front of them, and then they had to do the same and