American vs. British English: meaning of "One hundred and fifty"?

Question

I've noticed that Americans do not say "and" when speaking numbers: for example, 150 would be pronounced "one hundred fifty". I and most other British-English speakers would pronounce it "one hundred and fifty". I've seen a few different arguments on the net about which is "better", and something that is often asserted on the American side is that the "and" represents a decimal point - so "one hundred and fifty" would be interpreted as 100.50. This struck me as odd, since although I see a lot of American movies and TV, I don't think I've ever heard anyone actually do this. So my question: is this "and = decimal point" actually used in the USA, and can anyone cite some examples (maybe on youtube?)?

Answer 1

American English tends to be contextual so if I heard someone use "and" as a decimal I would understand but it's not a universal rule.

Some people say "a hundred" instead of "one hundred." If you say "a hundred and fifty" it's clear that you mean 150.

Another example - sometimes Americans say $1.25 as "a dollar twenty five". In this instance there was no word used to indicate a decimal point.

In school I learned to read numbers as "one hundred and fifty" so there may be some regional differences.