I was reviewing some problems that considered zero a multiple of say the number 5...meaning the multiples of 5 would start with zero, 5, 10, 15, etc...?

Is this the case...I never thought so....can anyone confirm this?...is this wrong?

Multiples whould actually mean product of number with natural number ( 1,2,3...)

Multiple of 5 would start with 5 not zero

In math, multiples result from multiplying any integer (including zero or negatives) by the starting number. So, yes, 0 is a multiple of 5, as is -5. Technically, 0 is a multiple of any number.

This test doesn't typically test this concept though - you'll see that these types of problems tend to limit you to positive integers. This doesn't mean they will never test this, but I haven't seen a problem in the past 10 years that does test this... so I wouldn't worry about it too much!