Which is the largest of the given numbers?
(a) $1000+0.01$
(c) $1000 / 0.01$
(e) $1000-0.01$
(b) $1000 \times 0.01$
(d) $0.01 / 1000$
The correct option is (c).

We have $1000+0.01=1000.01$ and $1000 \times 0.01=1000 \times \frac{1}{100}=10$, as well as

$$
\frac{1000}{0.01}=\frac{1000}{\frac{1}{100}}=1000 \times 100=100000
$$

and $0.01 / 1000=0.00001$. Finally, $1000-0.01$ is less than 1000 (no need to perform the calculation to reach this conclusion), so the largest of these numbers is $1000 / 0.01$.