What can you do with the number 9?

[RemyZee]

I am not a fan of numbers in that I have dyscalculia and they are swirling blobs to me, although I truly like the IDEA of numbers. But I've just learned there are all kinds of unusual, unexpected, absorbing things a person can do with the number 9, and it's given me an appreciation of the mysteries of numbers--though the calculations are difficult for me to understand because my noggin stops working and starts rebelling around the count of 15. I thought I would put this thread up to ask, for whoever is into numerals: what are some weird and whacky things you can do with 9?.

 

[Jumpinbare]

Add 9 to 9 and you get 18 add 1 and 8 and you get 9
add 9 to 18 and you get 27 add 2 and 7 and you get 9
add 9 to 27 and you get 36 add 3 and 6 and you get 9
this pattern continues all the way to 81

 

[Outdated]

Add 9 to 9 and you get 18 add 1 and 8 and you get 9
add 9 to 18 and you get 27 add 2 and 7 and you get 9
add 9 to 27 and you get 36 add 3 and 6 and you get 9
this pattern continues all the way to 81

It goes beyond 81.
9+0
9+9 =18, that's a break in the pattern, then:
1+0+8
1+1+7
1+2+6
Etc.

 

[AuAL]

Add 9 to 9 and you get 18 add 1 and 8 and you get 9
add 9 to 18 and you get 27 add 2 and 7 and you get 9
add 9 to 27 and you get 36 add 3 and 6 and you get 9
this pattern continues all the way to 81

If, when you get to 90 (=81+9) and add 9 to get 99, add 9 and 9 to get 18, then add 1 and 8, you get 9. So if you always recursively sum the digits until you get a single digit, it is always 9, i.e. the series is infinite.

 

[VictorR]

You can eat it!

Like how 7 8 9 (seven ate nine).

 

[Jumpinbare]

You can also have The Beatles saying it (Number 9) in the background of a song.