Answer
$0.00000000998$ is smaller.
Work Step by Step
We have $0.00000000998$ and $0.01$. In scientific notation:
$$ 0.00000000998=9.98\times 10^{-9}, \quad 0.01=1\times 10^{-2}.$$
Since $-9\lt -2$, then $0.00000000998$ is smaller.
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