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Edit: it appears that this is not exclusive to ADHD.
Posting this meme stemmed from my own efforts to explain my thought process when doing math and how it is similar to other people with ADHD doing math, while being different from every neurotypical person I'd talked to on the same subject.
While I didn't make the meme itself, instead finding it in my saves and wanting to share, I did accidentally spread misinformation that I had only backed up with personal anecdotal evidence.
I'll leave this up just so people can see the explanation below but this appears to not be ADHD related and just due to different people doing math in their heads differently...
Interesting, I make sets of 10. When I see 7 and 6, half of the 6 moves over to make 10 + 3. I say "moves over" because it feels like dividing tokens into sets in my head.
Elementary school had us using tokens for math constantly and it made it way harder for me. Especially cause 'showing our work' meant basically drawing the lil tokens on paper that were either black or white I think black represented a minus and white represented a plus (on paper, they were red and yellow irl). So I ended out doing the equation different and then reverse engineering the method they wanted from me.