Half of them. Every other number from 0 to 99998 is even.
Since there are 90,000 five digit numbers, that means that 45,000 of them are even.
To find the number of even five-digit whole numbers, we first note that a five-digit number ranges from 10,000 to 99,999. The last digit must be even, which can be 0, 2, 4, 6, or 8 (5 options). The first digit can be any digit from 1 to 9 (9 options), and the three middle digits can each be any digit from 0 to 9 (10 options each). Thus, the total number of even five-digit whole numbers is (9 \times 10 \times 10 \times 10 \times 5 = 450,000).
25
100
Not sure what a "didget" is. It is possible to make 18 5-digit numbers.
500 or so.
With a total of 90,000 five digit numbers, we can conclude that there is 45,000 EVEN five digit numbers.
There are five such numbers.
There are 252 of them.
25
90000
100
4,000 even numbers, 4,000 odd numbers.
There are 5460 five digit numbers with a digit sum of 22.
162
There are 180 3-digit numbers divisible by five.
2240
There are 450 even three-digit integers, from 100 to 998. This excludes numbers with leading zeroes (000 to 099).