Answer:
1/10
Explanation:
In its simplest form, expressing the decimal as a fraction to its simplest form will give one over ten.
Therefore if you divide 1/10, the answer will be 0.1. it is also called one-tenth.
Although there are other expressions or fractions that give 0.1, but 1/10 is the simplest of them all, and the question specified to use it in its simplest form.