The request was for a parent with a mathematically curious child (really, could be anyone then, am I right?) of 4 or 5 years.

Top:

*Moebius Noodles*, Maria Droujkova's great book about big math ideas to explore. There were articles about calculus in kindergarten when it first came out.- Great new book:
*Which One Doesn¹t Belong.*OK, I'll say more. I love this book because it's clever and pretty, but also because it can teach you how to read mathematically rich literature. *Math Curse*, Lane and Scieska: just the best math book ever written. Nearly anything can be a problem, you know.

Great:

*Anno's Mysterious Multiplying Jar*, or anything by Mitsumasa Anno. Just charming books, and lovely besides.*Spaghetti and Meatballs For All*, Marilyn Burns: my favorite of the explicitly mathematical genre. Tang and Murphy have their place but Burns is the queen of the genre. (*Greedy Triangle*,*Smarty Pants*,*$1 Word*...)- Princess of the genre, Elinor Pinczes:
*One Hundred Hungry Ants*,*A Remainder of One*, ... *Infinity and Me*by Kate Hosford*Tessallation!*by Emily Grosvenor*Grandfather Tang’s Story*, by Ann Tompert*The Dot and the Line*, by Norton Juster

Biography:

- Paul Erdos, The Boy Who Loved Math by Deborah Helligman
- Fibonacci,
*Blockhead*by Joseph D'Agnese - Eratosthanes,
*The Librarian Who Measured the Earth*by Katherine Lasky - Einstein usually gets lumped in here. Not a mathematician, technically, but if you're being that technical, loosen up!
*Try Odd Boy Out*or*On a Beam of Light*

What to do:

- Chris Hunter has a bunch of recommendations plus how to use them.
- Another post with a lot of suggestions at Algebra's Friend
- Suzanne Alejandre suggested the old (aka classic) NCTM guide, Welchman-Tischler's book, might provide ideas? (She found a digital copy; use the NEXT button)
- Marilyn Burns (herself) just suggested this starting point from PBS

Possibly for older, but like Madeline L'Engle, I think people underestimate kids:

*The Phantom Tollbooth*, by Norman Juster*The Man Who Counted*, by Malba Tahan*Flatland*, by Edwin Abbott*The Number Devil*, by Hans Magnus Enzensberger*The Adventures of Penrose the Mathematical Cat*, by Theoni Pappas*The Cat in Numberland*, by Ivar Ekeland and John O'Brien*A Wrinkle in Time*, Madeline L'Engle (First I heard of a tesseract.) There's an audiobook where L'Engle reads it herself. Highly recommended.

And please add your own suggestions!

PS:

PS:

- Cindy Whitehead saw that I missed the Sir Cumference books, by Cindy Neuschwander, and suggested the Go Figure books, by Johnny Ball.