Okey-dokey.
I have no idea what the heck you are asking.
'What numbers do you find in the ones digit for the number 2?' Well, the number 2 is only one digit, so the answer would be, '2.'
DUH!
5 and 0
There are 45 of them.
The ones digit in an even number can be one of: 0, 2, 4, 6, 8.
421 and 842
Hint, but not your answer: You know your answer has to be between 11 and 99. Furthermore, it has to be a square. One, two, and three when squared are still single digit numbers. Four squared is 16, which is not squaring the ones digit. Keep going...
The answer depends on what the tens digit is greater than, and what the ones digit does then.
Only one positive prime number has a 5 in the ones digit. That prime number is 5. All other numbers with a 5 in the ones digit are composite because they will be divisible by 5.
The ones digit in the product from multiplying the 305 prime numbers less than 2012 is 0 because the ones digit becomes 0 after 2 and 5 have been multiplied and remains unchanged after more prime numbers are multiplied.
Not sure what you're asking, but here are some examples of numbers that have a tens digit less than the ones digit: 13, 205, 1367, 29.632
Zero.
40, 51, 62, 73, 84, and 95
8 of them.