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200  169 = 31, but if I say that I watched episodes 169200 of Detective Conan, that means that I watched 32 episodes. This just doesn't feel right. How do I learn to count this stuff correctly and, more importantly, how do I convince my brain that the method is indeed correct?

extremely basic stuff, but apparently not a terribly uncommon problem:
https://en.wikipedia.org/wiki/Offbyone_error#Fencepost_error
here's a thread where the explanations might be easier to understand:
http://math.stackexchange.com/questions/484393/whydoyouadd1incountingtestquestions 
kuchitsu said:
how do I convince my brain that the method is indeed correct?
My method of turning math/logic principles from unintuitive to intuitive for my brain is thinking of concrete analogies with small numbers and/or a small range of numbers. If you know you watched episodes 910, it's clear that you watched 2 in total. If they were 911, it's 3 in total. Basic, but whatever. If you repeat thinking about this analogy every time you're in doubt, and at least several times over a longer period of time, it should get intuitive even for larger numbers.
