To convert the decimal 0.167 into a fraction, we start by recognizing that the number can be read as 167 thousandths. This means we can write it as:
0.167 = 167/1000
This fraction is already in its simplest form, as 167 is a prime number and does not have any common factors with 1000. Therefore, the final answer, in fraction form, is:
0.167 = 167/1000