Fill in the blank to create the two digit number

The two digit number 1 is divisible by 9

at this point I am just talking randomly but bai!(´▽`ʃ♡ƪ)

The two digit number is 90.

also forgot to say this but,....have a nice day!╰( ̄ω ̄o)

Answers:

1. 8
2. 2, 3, 4, 6.
3. 72
4. 3
5. 4 ☆*: .。. o(≧▽≦)o .。.:*☆ヾ(≧▽≦*)o(´▽`ʃ♡ƪ)
yw!!