Which of the following numbers is the largest?
$\text{(A)}\ .99 \qquad \text{(B)}\ .9099 \qquad \text{(C)}\ .9 \qquad \text{(D)}\ .909 \qquad \text{(E)}\ .9009$
We have $.99>.9099>.909>.9009>.9$, so choice $\boxed{\text{A}}$ is the largest.