The answer depends on what the tens digit is greater than, and what the ones digit does then.
Well, if the tens digit is 1, you have 1 option for the ones digit; if the tens digit is 2, you have two options for the ones digit, if the tens digit is 3, you have 3 options for the ones digit, etc.; up to: if the tens digit is 9, you have 9 options for the ones digit. Add all that up (1 + 2 + 3 + ... + 9).
5
It is 9 times greater.
16
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.
Probably 73.
89 is a prime number between 70 and 100 that has the ones digit one greater than the tens digit.
There are 45 of them.
-3
4
It is 9 times greater.
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 = 45 (10,20,21 etc etc)
91
How about: 11, 13, 17, 19 .... etc
Is it only 890 and 891
Since cents are only in whole numbers, you look at the digit directly to the right of the ones digit. In this case, it is a 7. Since that is 5 or greater, the ones digit is rounded up. The answer is 16 cents.
23
16
8 of them.