a. Lists of multiples:

b. Sample responses:

The lengths of the lists vary a lot. The last one is just 1 number long.
There is one that's 2 numbers long and then a bunch that are five numbers long and ten numbers long.
The ones that are five numbers long appear regularly.
Except for 10, it takes 5 multiples of even numbers to get to the first multiple of 10.
Except for 5, it takes 10 multiples of an odd number to get to the first multiple of 10.

4.6.A Practice Problem 10 Scoring Guidance