If you use all of them each time, then 5*4*3*2*1 = 120. Of these, 24 will have a leading 0.
There are 325 different numbers of 1-5 digits although, again, some of them begin with 0. These are the same as shorter numbers without the zero: that is, 023 has the same value as 23.
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48 of them if digits may not be repeated. 100 if they can.
There are 60480 numbers.
There are 4^6 = 4096 such numbers.
If the digits are all different then 18. Otherwise, 192.
9 odd numbers less than 100 can be formed. They are: 3,5,7,35,37,53,57,73 and 75.