The first one is 5, and -5 is also one of them..
The others are all the whole numbers, both positive or negative,
with two or more digits where the last digit is either 'zero' or 5 .
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Since 10 is a multiple of 5, all multiples of 10 are multiples of 5.
Multiples of 50 are the only numbers that are both. All other multiples of 5 aren't.
Itself and any of its multiples that ends with a 5
Do you mean common multiples? If so, then 30, 60, 90 etc. are common multiples of 30 and 5. If you mean multiples of 5 and factors of 30, that's 5, 15 and 30.
Any multiple of 10 is a multiple of 5 and 10