# 7 and 8 years old

Seven and eight-year-olds are making arguments. They’ll tell you something is true, and why it has to be true. More and more, they see math in the world, and they want to tell you about it.

Same Idea or Different?

## Same Idea or Different?

I am currently writing the teacher guide for my next book, How Did You Count? (See a couple of teaser photos at the end of this post!) A section of a chapter of that teacher guide has the heading Seek to Understand and to Be Understood. Those who know my teaching...

A walk around the lake

## A walk around the lake

A very snowy winter is turning to a long, slow spring here in Minnesota. It is the kind of spring that makes us joyful for sunny 45° days. So I went for a long walk Sunday afternoon. Together with a meaningful percentage of the population of the city of Saint Paul,...

Five fun things to do with 21st Century Pattern Blocks

## Five fun things to do with 21st Century Pattern Blocks

I wrote last week about the release of 21st Century Pattern Blocks on a much larger scale than before. This week, I want to share five fun math adventures that begin with these blocks. 1.Scaling Which 21st Century Pattern Blocks can you use (any number of)...

A 21st Century Challenge

## A 21st Century Challenge

After seeing Hana Murray's lovely study of rectangles made from 21st Century Pattern Blocks, I started playing and noticed that many of them seemed to involve the small green triangles. Pretty soon, I had formed a conjecture. Using copies of these at least two...

21st Century Pattern Blocks Scaling Up

## 21st Century Pattern Blocks Scaling Up

I am very excited to let folks know that Dan Finkel of Math for Love has scaled up 21st Century Pattern Blocks production and availability. They've been available here on this site for a few years now. At first I was making them on a maker-space laser cutter, then...

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!

Let the children play

## Let the children play

Reflections on the first Math On-A-Stick at the Minnesota State Fair