Overall, there are 99900 numbers between 100 and 100000, not including 100 itself.
One out of every ten of them ends with a nine, which leaves us with 9990 numbers.
It is easier to understand this for small numbers - say we look for the corresponding number between 10 and 100. We have overall 90 numbers, 9 of them end with the digit 9: 19,29,39,49,59,69,79,89,99.
every other number between 100 and 100000 can be divided by 3. therefore there are 100000-100= 99900 numbers between 100 and 100000. and 99900/2= 49950 numbers that can be divided by two between those two (i'm not sure if that includes the endpoints, you'll have to give some serious thought to that one)
1089
An infinite amount
There are 449999 such numbers.
There are 90,000 such numbers.
1089 palindromes
There are 9592 primes.
100.
There are 89,999 numbers between 100,000 and 999,999 that are divisible by 10.
There are infinitely many numbers. Two examples are 21356/100000 and 3/10.
Including the 2 numbers you listed, 25,000Not including the 2 numbers you listed, 24,998
theres only 1 number which is 123456, the least digit is 1 and the greatest is 6