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Hi,everyone

I would like to ask questions about expression of number in English here,

If i express 21,46 and the other two-digit number in words,should i separate the two words with hyphen'-',like twenty-one,forty-six ?

Can i leave the hyphen out,like twenty one,forty one...Here i mean is not to be an adjective,twenty-five clothes..

260 or 351 and etc, written in words,is it necessary add 'and' between the figures such as two hundred and sixty,three hundred and fifty-one ?

l learned that it need not add 'and' between the number in American English,two hundred sixty....

Numbers between 1000 and 1,000,000 is usually said or written in words as:
1,803 = one thousand, eight hundred and three (AmE: one thousand, eight hundred three).Is it right?

1706 =seventeen hundred and six (or 'seventeen oh six'),can i express 1706 in seventeen oh six?Is it formal or not?

1800 can be said or written as "eighteen hundred" or " one thousand eight hundred ",which one is formal and common used in spoken English ?
Thanks in advanceEmotion: big smile
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If i express 21,46 and the other two-digit number in words,should i separate the two words with hyphen'-',like twenty-one,forty-six ?-- Yes.

Can i leave the hyphen out,like twenty one,forty one...No

260 or 351 and etc, written in words,is it necessary add 'and' between the figures such as two hundred and sixty,three hundred and fifty-one ?-- No

l learned that it need not add 'and' between the number in American English,two hundred sixty..-- I have already told you that it is not a regional difference. The option exists throughout the language.

Numbers between 1000 and 1,000,000 is usually said or written in words as:
1,803 = one thousand, eight hundred (and) three
1706 =seventeen hundred and six (or 'seventeen oh six'),can i express 1706 in seventeen oh six?-Yes Is it formal or not?- It is neutral.

1800 can be said or written as "eighteen hundred" or " one thousand eight hundred "-- Not for a date.
,which one is formal and common used in spoken English ?-- Only the first is possible for a date; otherwise, both are fine.
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So that it means 1800 is eighteen hundred or 1801 is eighteen hundred and one when i'm expressing a year or date;otherwise,i can say 1800 and 1801 as either eighteen hundred or one thousand eight hundred and eighteen hundred and one or one thousand eight hundred and one respectively,am i?
That's right.