All those that end with 0 or 5 are divisible by 5. That would be 1000, 1005, 1010, ... 9990, 9995. There are 900 such numbers.
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Any number that ends with 5 or 0 except 0 itself is divisble by 5
There are 9 x 10 x 10 x 10, or 9000 four-digit number that can be formed if the leading digit cannot be zero.
24 ways
There is 90 four digit palindromes.