1000, 1004, 1008 and just keep adding four until you get to 9996.
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All of the four-digit multiples of 400 end in 00.
Nine. The sum of the digits must be a multiple of 9; because of the repeated digits, this is only possible if the first two digits add up to 9.
The digit of 4 in 0.004 represents 4/1000 = four thousandths
The first 4 multiples of 1 are: 1, 2, 3, and 4.
There are 90 four-digit palindromes