543 and there is no need to add a decimal point after the number.
.043
0.349
It is 300.047
0.143
.349
7043.742
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".
0.341
Forty five thousand, three hundred assuming decimal is at the end.
It is forty seven thousand three hundred eighty five hundred thousandths.
Three hundred forty-six thousandths
Three and two hundred forty-seven thousandths.