Three hundred forty-two thousands in decimal form is 342,000
One hundred forty three 143. (notice the decimal point after the three)
It is 300.047
Forty five thousand, three hundred assuming decimal is at the end.
With zeroes after the decimal point, the numeral is simply "forty thousand three hundred". As a dollar amount, it is "forty thousand three hundred dollars and no cents".
It is forty seven thousand three hundred eighty five hundred thousandths.