Two thousand five hundred.
MMD would be 2500.
Twelve.
If they know the language, then yes. They also "borrow" English words and on occasion write them in English instead of katakana.
Sixty-one.
30 = thirty
Please write your question in English, if you know how to write in English.
2.500
2500
650 can be written as "six hundred fifty" in English words.
Thirty-five billion.
the alphabet is the only way to write words in English.
2500 is two thousand, five hundred.