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.
The area of Texas is 3.09 times as great as the area of Minnesota.
Reading the weather page

Reading the weather page

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...

Cookies under constraints

Cookies under constraints

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...

Griffin in front of huge walleye statue
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...