A bit on the lighter side, I do recommend The Man Who Counted which I read as a kid and absolutely loved https://www.amazon.com/Man-Who-Counted-Collection-Mathematic... (https://www.amazon.com/Man-Who-Counted-Collection-Mathematical/dp/0393309347) I read the original in Portuguese but would assume it's just as good in English, given overwhelmingly positive reviews on Amazon See also https://en.wikipedia.org/wiki/The_Man_Who_Counted It won't really teach him math per se, but if my experience is any indication, it will get him hooked on developing intuition and he'll find beauty in otherwise mundane topics such as arithmetic. It's an incredibly engaging story aimed at younger readers but fun for people of all ages – think Arabian Nights with a character that loves math. Come to think of it, I've got to buy it again and re-read it one of these days
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The Man Who Counted
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