How often do you think in words, and how often in visuals, sounds, and so on? Do you normally think by picturing things, or engaging in an internal monologue, or what? Or is the distribution sort of even?
I'd say something like internal monologue, for thinking anyway (this may be internally sounded, I know that I think word-thoughts in my own voice, but I regularly think much faster than I could possibly speak, until I realise that fact, when the voice becomes slow and I start repeating myself, and then get annoyed at my brain for being so distracting).
For calculating or anything vaguely mathematical I use abstractly spatial/visual sorts of thoughts -- abstract meaning I don't have sufficient awareness of the architecture of my brain to tell you accurately ...
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.