Why is "триста мільйонів" and not " мільйон " ?
Тирста = 300, so its last digit is 0, so the noun that follows it is in the genitive plural.
If the last digit is 1, then it gets nominative singular; if it's 2, 3, or 4, then it gets nominative plural; and if it's 5, 6, 7, 8, 9, or 0, it gets genitive plural.
million? not millionS ?
millions is used when the number is apporximate, for example "Millions of viewers watch our show every month"
Why it's in the Letters 1 section?