# 9 and 10 years old

Nine and ten-year-olds are using math to do stuff. They’ll design a brand new pattern the world has never seen, and then devise a scheme to beat you at cards.
Tessalation: A great new book

## Tessalation: A great new book

This beautiful book helps us see the world through a child's joyful, creative, mathy eyes.

The Summer of Math

## The Summer of Math

A summer subscription service—currently on hiatus, but stay tuned!

An important part of training young minds is modeling a healthy skepticism. Today's weather column in the Star Tribune included the following observation: Minnesota is nippy during the winter...but we don't have to stress about tsunamis, volcanoes or...

A tale of two conversations

## A tale of two conversations

What was, what might have been, and what could be....all in a conversation about marshmallows.

A propos of nothing one day, I ask Griffin (9 years old at the time, finishing up fourth grade) a question. Me: Griff, imagine you are baking cookies and you need $latex \frac{3}{4}$ cup of sugar, but you only have a $latex \frac{1}{2}$ cup measure. How would...

Math in the alphabet

## Math in the alphabet

The children attended a well-run chess day camp this summer. Good people running things; a warm and welcoming atmosphere. Lots of varied activities to keep kids' bodies engaged as well as their minds. Sadly, this takes place on the complete opposite end of the...

Dots!

## Dots!

The New York Times published an article about Common Core homework this week. As is going to be the case with a news article (in contrast to say, a post on a blog dedicated to children's mathematical ideas), one can't really learn any mathematics from the...

Nights of Camping

## Nights of Camping

The following conversation took place in the run-up to our annual summer camping trip recently. Rachel has no interest in camping, so this ritual is all mine. I started the little ones young with a one-night trip within an hour from home so that we could come home...