Answer: two and eighty-one thousandths
Explanation:
We will write this out in words. The one is in the thousandths place, so we read it as eighty-one thousandths.
2 ➜ two
. ➜ and
81 ➜ eighty-one
0.081 ➜ eighty-one thousandths
2.081 ➜ two and eighty-one thousandths