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I think that the largest odd number is 9875.First I used the biggest 3 numbers avaliable which are 9,8 and 7 then added 5 because that is the biggest odd number that I have'nt used.

I think that the largest even number is 9876.First I used the biggest 3 numbers 9,8 and 7 then i added the biggest even numbers which would be six.

I think that the largest multiple of 3 is 9875.First I got 9900 then counted back in three's untill I got to 9875 which dosen't have two of the same number.

I think that the smallest multiple of five is 1000.Because 1000 is the first four digit number that is a multiple of Five.

First I got 4900 then added the biggest two numbers before nine which made 4987.