Compulsion: Finding the Average Digit

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When I see numbers such as car license plates, phone nos., addresses, I immediately add up the digits to see if there is an 'average digit.'
Anyone one else ever experienced this?
Here there are 4 digits on car license plates, so, if it adds up to 16...not only is the average 4, but its also the square root...! !!

That sounds like a fun game.
What I do is I use the numbers (3 over here) and use the letters (3 also) to relate it to physics. Or sometimes astronomy.

i like drawing lines across the road for some reason. from post to post, depending on color and/or size... and blocks of lawn!

Oh god, that's going to keep my occupied when i walk to the train station now, past the parking lot.

Thanks!

I have to see if numbers are multiples of three.

I have a thing about grids. When I see one like this:

I start trying to see how big a square I can make from all the small squares. For the diagonal one here, it is 3x3. If the grid is straightforward parallel lines at 90 degrees to one another, the same thing happens. If they don't make regular squares or diamonds or whatever because the tiles are different shapes and sizes, it breaks the pattern and can be very irritating to look at. Here is a good example (too big to post here) :

http://www.concretestyle.com/RobinsonKitchenFloor111.jpg

YUCK!! I could not live in a house which had that kind of tiling.

My brain would never accept that 3 by 3 one, the corners are cut, it'd go to 1 by 1 and get frustrated with not finding a "real square" inside .
As for the numbers, my brain does somethig closer to finding halves. If the total is 16 as in your example , it would take the numbers and try to make an 8, then a 4 (if there's a 3 and a 1 or whatever) etc. Ridiculously pointless.

I have a tile pattern on my kitchen floor, each tile is a rectangel of varying length and width, I have a compulsion to not ever walk on the largest rectangle - and it's a repeating pattern so the largest one comes up every metre.

In my head I think the following compulsively;
RIGHT LEFT
LEFT RIGHT
LEFT RIGHT
RIGHT LEFT

LEFT RIGHT
RIGHT LEFT
RIGHT LEFT
LEFT RIGHT

and I'm trying to get symmetry, it's not symmetrical because it starts on right, so another section must start on left, but then it's still starting at the top on right, so I need to start a new one, and that can go on and on.