None because 001 is the same as 1
.001
The 0005 is larger without a decimal points. If you meant .001 and .0005, the .001 is larger.
Without a decimal point, they are both the same. If you asked "Which is less .01 or .001", then .001 is the smaller number.
.001
.001
one-thousandth as a decimal = 0.001
.001
0.000 001
.001
depends, you want it before or after the decimal point? before= 001 after= .001
the larger number is 0.1 because a tenth, which is the first place value after the decimal is bigger than a thousandth, which is the third number after the decimal.