You would write it as 3000.059
50000.00003
The way ou would write six thousand two hundred and three hundred eleven hundred thousandths is 6200.311
0.0320
Assuming you mean (eleven thousand-five hundred three) thousandths, that the same as 11503 / 1000 = 11.503 If you actually meant eleven thousand-five hundred AND three thousandths, that would be 11500.003
2003.02003
0.3 is three tenths, or: thirty hundredths, three hundred thousandths (not to be confused with three hundred-thousandths, 0.00003), three thousand ten-thousandths, etc.
three thousandths
3000.00003
You write it as 11,500.003
Three thousand five ten-thousandths in standard notation = 0.3005
Three thousand fourteen and five thousandths written in standard form is 3014.005