And Australian English is typically a "hybrid" of American English and British English, leaning towards the latter.
Oh my goodness, you omit the "and"! That sounds terrible! I would say it doesn't comply with the English pronunciation of sentences.
I once had a teacher at my school: Mr. Witwitski. His name is Polish, and so it is pronounced correctly: Veetveetski. But we can't say it, it doesn't sound right. So we called him "Mr. Witwicki".
We say numbers like so:
One million, two hundred and eighty-four thousand, three hundred and sixty-seven and four hundred and nine hundredths, five hundred and fourty-six thousandths
I'm not sure how to judge this challenge anymore… There are some things about American English that I agree with, and some things that I do not. For instance, I like the way that American English is much more phonetic than British English (for example, the use of the letter "z"). But I don't like the omitting of the word "and".