0.5
500.0010 is five hundred and ten ten-thousandths0.0510 is five hundred ten ten-thousandths.(If there is a decimal point and an ``and", the and is where the decimal point goes.)
0.0005
0.5
0.0005
10.05
10.05
0.0005
"One and five ten-thousandths" = 1.0005
0.0045
50.0085
0.0205
If you wrote the question exactly as you meant it, then I would write 50,000 . If you meant to write "five ten-thousandths", then I would write 0.0005 .