That would be all the numbers that end with 0 or 5. So:* For the first digit, you have 9 options (digits 0-9).
* For the second digit, you have 10 options.
* For the third digit, you have 10 options.
* For the fourth digit, you have 2 options (the digits 0 or 5).
You can multiply all those together.
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There are an infinite number of multiples of 5
lcm(2, 3, 5) = 30 → 2 digit common multiples are 30, 60, 90.
There are 7200 such numbers.
The integers divisible by those 5 numbers are exactly the multiples of 1008. The largest multiple of 1008 which is still a four-digit number is 9*1008 = 9072.
If the digits can be repeated, then there are (5 x 5 x 5 x 5) = 625 different four-digit numbers.If the digits can't be repeated, then there are (5 x 4 x 3 x 2) = 120 different four-digit numbers.