Question

I don't understand what this question is asking: Which digits are in the ones place of a number multiplied by 5?
a.0 or 1
b.0 or 5
c.2 or 4
d.2 or 5

Can someone explain what this question is asking, the answer, and why?

Answer 1

5 * 1 = 5
5 * 2 = 10
5 * 3 = 15
5 * 4 = 20
5 * 1001 = 5,005
etc.
When you multiply any number by 5, what two numbers will be the last digit?

Answer 2

Makes sense now. Thank you!