9 and 99
99 + 9 = 108
The largest digit is 9.
It is 9.
9
The largest one digit number that has three factors is 9. Its factors are 1, 3, and 9.
300
The largest 5 digit number is 99999. If this is divided by 11 it leaves a remainder of 9. Therefore the largest 5 digit number divisible by 11 is 99999 - 9 = 99990.
8888
9
9.
9.....??