Byrne Hobart
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 Enzensberger
A 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.