Followers who were into math at an early age: what math books/games did you like as a kid? (Our oldest is 5 and is on a math kick right now, which we’d like to maximally encourage.)
Book mentions in this thread
The Number Devil
by Hans Magnus EnzensbergerA fascinating fantasy for adults and children alike explores the world of mathematics as it recounts how math-hater Robert has twelve dreams in which a Number Devil demonstrates the delights of such mathematical concepts as prime and Fibonacci numbers, delving ever deeper into mathematical theory. Reprint.