Why is .0057 smaller than .006?

Can you explain why the decimal .006 is bigger than .0057? And why .04 is bigger than .008? In the packet I have it explains to me to add a zero to the end of the decimals I want to compare and see which is bigger, so if I added a zero to .006 and make it .0060, then add a zero to .0057 and change it to .00570, isn't five hundred seventy ten-thousandths bigger than sixty ten thousandths? Or am I reading these decimals wrong?