you don't you write two hundred million, seven thousand. but...
two hundred seven and two hundred seven thousandths
Two thousand seven hundred is 2700 (which can colloquially be called "twenty-seven hundred").
702,200 = seven hundred two thousand, two hundred.
two hundred seventy nine thousand seven hundred = 279,700
You can write 2750.
Seven hundred and two thousand seven hundred and ten.
How to write three hundred forty-two hundreds, seven hundred nine
seven thousand, two hundred
Two and seven hundred sixty-eight thousandths
Two-hundred and forty-seven point zero-eight.