What is a list of the five multiples of 9?

Answer 1

"The" five multiples is wrong; there are infinitely many multiples for any number (except zero), not just five.

To get those multiples, just use the definition of multiple. That is, you can do any of the following multiplications:

9 x 0

9 x 1

9 x 2

9 x 3

etc., also:

9 x (-1)

9 x (-2)

etc.