math puzzle

[bearded]

(i created this myself.)
under what circumstances is it true that 6+6=81?

[Adamence]

[spoiler]When it's rotated 180 degrees[/spoiler]

[The Phantom Eyebrow]

What Adamence said...

[spoiler]However, it would also be true (at a minor stretch) if you rotate each symbol on its own axis by a little more than 180 degrees (225 degrees say), so that the 6's become like 9's, the 8 and 1 still look like 8 and 1 and the + symbol would become like a multiplication symbol, giving you 9 x 9 = 81.  Sorta...[/spoiler]

[the_ultimate_evil]

[spoiler]When it's rotated 180 degrees[/spoiler]

[spoiler]correct to a degree, but if you rotate a + by 180 degrees you still only get a +, it would have to be 45 degrees[/spoiler]

[Previsionary]

[spoiler]When it's rotated 180 degrees[/spoiler]

[spoiler]correct to a degree, but if you rotate a + by 180 degrees you still only get a +, it would have to be 45 degrees[/spoiler]

[spoiler]Flip the WHOLE thing, UE. If my thinking is correct, you'd get 18= 9+9[/spoiler]

[the_ultimate_evil]

this is what happens when you do 5 things at once

[BWPS]

Good puzzle!

In what situation is 2 + 2 = -4?

[Glitch Girl]

Dunno BWPS, but one of my favorites is

Explain how 10-1=1 is correct.

[Panther_Gunn]

Dunno BWPS, but one of my favorites is

Explain how 10-1=1 is correct.

[spoiler]Binary 2 minus Decimal 1 = 1 (either notation)[/spoiler]

c'mon, GG, you gotta try harder than that for a bunch of geeks that like computer games  ;)

[Glitch Girl]

Never said it was hard, just that it was a favorite.  :)

Kinda like this one

[BWPS]

http://funnyexamanswers.com/

I'm sure most of you have seen this stuff, but funny exam answers are some of the best stuff ever. I'd also link to a certain Oedipus Rex essay, but it's not exactly appropriate.

[Adamence]

In what situation is 2 + 2 = -4?

A couple possible answers:

[spoiler] When there are absolute value signs, since:
|2+2| = |4| = |-4|[/spoiler]

or

[spoiler] When doing arithmetic modulo 8. 
2 + 2 = 4 mod 8, and -4 = 4 mod 8.  So 2 + 2 = -4 mod 8. [/spoiler]

[BWPS]

In what situation is 2 + 2 = -4?

A couple possible answers:

[spoiler] When there are absolute value signs, since:
|2+2| = |4| = |-4|[/spoiler]

or

[spoiler] When doing arithmetic modulo 8. 
2 + 2 = 4 mod 8, and -4 = 4 mod 8.  So 2 + 2 = -4 mod 8. [/spoiler]

The correct answer is in Bizzaro world.

[Sevenforce]

2 + 2 = 11...in base 3 ^^

Shameless math nerds unite!

[Glitch Girl]

Obviously a sign near MIT