If you're looking for books for older children, e.g. 9-13, The Boy Who Reversed Himself, The Man Who Counted and The Number Devil, which are listed here, are fa

If you're looking for books for older children, e.g. 9-13, The Boy Who Reversed Himself, The Man Who Counted and The Number Devil, which are listed here, are fantastic. For the younger audience, e.g. 6-9, I suggest the Math Adventures books, e.g. Sir Cumference and the Isle of Immeter, which are illustrated and introduce mathematical concepts in a fun and subtle way.