My number has tens digit that is 8 more than the ones digit. Zero is not one of my digits. What is my number?

Question

The answer is a 2-digit number that matches the clues.

Answer 1

Since we cannot have a 0 in our digits, let's look at the other numbers starting with 1:

1 + 8 = 9

2 + 8 = 10

 

Since using two gives us a 0 (and two digits of its own), we're left with only 1:

_1

And since 1 + 8 = 9, that means that 9 is in the tens' place:

91

Answer 2

The only answer is: 91