# Geometry

Angles, polygons, spirals, and circles.

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...

Which fits where? A three-dimensional challenge

## Which fits where? A three-dimensional challenge

Each solid fits in at least one cutout, and each cutout fits at least one solid. Which is which and how do they fit?

In Defense of the Diamond

## In Defense of the Diamond

Do children need to say "rhombus" instead of "diamond"?

Talking Shapes with Kids

## Talking Shapes with Kids

I have been spending time talking with kindergarteners, first and second graders in schools about my shapes book (coming from Stenhouse, Spring 2016). Many more school visits are ahead of me. I have written up some reflections for a more teacher-ish audience than...

Building a better shapes book [Which One Doesn’t Belong?]

## Building a better shapes book [Which One Doesn’t Belong?]

IMPORTANT NOTE: The moment alluded to below has arrived! Which One Doesn't Belong? is now available from Stenhouse as a student book (awesome for home reading, too!) and a teacher guide. As a result, I have removed all links to the version I was...

Fun with tiles

## Fun with tiles

It is no secret that one of my proudest achievements is creating a lovely space on Twitter where people share stories of children's math talk. Come read along on the #tmwyk hashtag. That's where I came across this tutorial-in-photos. I decided to make myself some....

Spirals

## Spirals

A few weeks back, this short cryptic video came to my attention thanks to the magic of Twitter. https://vine.co/v/MMEJuOXYndP Thanks to kids connect (@KinderFynes on Twitter) For more than a year now, I have been posting links and other short bits on Twitter using...