其它
The digit $9$ in what number represents a value of $0.09$? 
Overseas Competition->Knowledge Point->Calculation Modules->Decimals->Basic Understanding of Decimals
If the digit $$9$$ represents a value of $$0.09$$, it means the digit $$9$$ is located on the hundredth place on that number, which is the second digit after the decimal point.  Check Lesson 4 Concept 1 on textbook 