# Numbers

DumDum81
Posers and Puzzles 10 Mar '04 20:44
1. 10 Mar '04 20:44
What do the numbers 11, 69, and 88 all have in common?
2. 10 Mar '04 21:35
Originally posted by DumDum81
What do the numbers 11, 69, and 88 all have in common?
they all look the same upside down or in a mirror.
3. 10 Mar '04 21:38
They are all numbers ðŸ˜€
4. 11 Mar '04 17:421 edit
Originally posted by chatterbox
they all look the same upside down or in a mirror.
upside down (as in rotated 180 degrees in the plane of the writing surface) is right, but not in a mirror, at least not 69, which will make the digits themselves look backwards (a reversed &quot;9&quot; looks remotely like the &quot;@&quot; )!

here is a slightly more dificult problem:
assuming we retain the present calendar, what will be the next time we see a year that reads the same if inverted (i'm talking as written, not as shown in a seven-element digital display)?
5. 11 Mar '04 17:49
3003?
6. 11 Mar '04 18:33
Originally posted by qwiksylver
3003?
oops! i need to clarify.
&quot;inverted&quot; as in &quot;rotating 180 degrees in the plane of the writing surface&quot; if you do that with 3003, you get something like &quot;E00E&quot;.
the method you suggest rotates around a horizontal axis through the middle of each digit, but you have to leave the plane of the writing surface.
sorry for the confusion!
7. 11 Mar '04 19:24
Originally posted by BarefootChessPlayer
upside down (as in rotated 180 degrees in the plane of the writing surface) is right, but not in a mirror, at least not 69, which will make the digits themselves look backwards (a reversed "9" looks remotely like the "@" )!

here is a slightly more dificult problem:
assuming we retain the present calendar, what will be the next time ...[text shortened]... e if inverted (i'm talking as written, not as shown in a seven-element digital display)?
6009?
8. 12 Mar '04 18:04
Originally posted by iamatiger
6009?
yup!
can you figure out the rest of the four-digit ones?
9. 12 Mar '04 18:181 edit
1001
1111
1691
1881
6119
9116
8118
6009
9006
6699
6969
6889
8008
8698
8968
8888
9006
9886
9696
And thats all I got off the top of my head