There are 6,750 such numbers.
60 numbers
500
81
There are 450 of them.
There are 720 of them.
8100
The 3-digit counting numbers are 100 through 999 = 900 numbers.Half them are multiples of 2 (even numbers).The other half are not . . . 450 of them.
4500 of them.
5 ans 3
There are 9*10*9 = 810 such numbers.
There are 898 three-digit even numbers. Nine of them are multiples of 55. That leaves 889 * * * * * There are 450 three-digit even numbers and 17 of them are multiples of 55. So that leaves 433.