"Uno" changes to "un" before a masculine noun and to"una" before a feminine noun.
un libro/una chica This is also true for the numbers 200, 300, 400, etc.
"Y" is not used to separate hundreds from tens.
Correct: ciento ochenta y nueve Incorrect: ciento y ochenta y nueve
When there is exactly 100 of something use "cien." / cien dólares
In Spanish a period is used to indicate thousands, and a comma is used as a decimal point.
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