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Still slightly mad about the time (when I was very young) I was fucking up basic addition by one and the teacher didn't get why.
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Like 10 years later I learned the term "fencepost error", and was like "look, this is the thing!" in my head to them. No idea who it was.
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Anyway, numbers make way less sense than they seem to, when you think about it in the right way.
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I recommend the book "Where Does Mathematics Come From" is you want to take apart and reassemble your concept of what numbers are.