Tags » Geometry

Filling the Ball with Air

A few weeks ago, we watched Nathan Kraft’s Soccer Ball Inflation video on 101 questions.

What mathematical question could we explore?

how many more pumps did it take to fill the bigger balls           1… 925 more words


The Side-Splitter Theorem

CCSS-M G-SRT.B.4. Prove theorems about triangles. Theorems include: a line parallel to one side of a triangle divides the other two proportionally, and conversely; the Pythagorean Theorem proved using triangle similarity. 164 more words


Examples of geometric prints from Tates collection

Atheletes 1973, Julian Trevelyan

1949, Geraldo de Barros

Great Mosque, Cordoba, Spain. 1996. Langlands & Bell

1962, Sir Eduardo Paolozzi

1962, Sir Eduardo Paolozzi


Minimal Printmaking

soaking paper

rolling out inks

etching press

Last week we experimented with printing of basic geometrical shapes. Using card we cut out triangles, circles and squares and used these for planographic printing.


Building a better shapes book

There are many shapes books available for reading with children. Most of them are very bad. I have complained about this for years.

Now I have done something about it. 540 more words


Caitlin Duncan reblogged this on How To Math and commented:

I am so excited to repost this blog. Christopher Danielson, who writes Talking Math with Your Kids,  has created a super shape book that is accessible for all ages. What's great about the book is that there are no right or wrong answers. This book is all about explaining and justifying your thinking. I can't wait to share this resource with my kindergarten teachers who are just about to begin their geometry units! When I first read the post I was sitting next to my own kindergartener (the one who I take home every night) and I thought, "Hey, I'll try this out on her." We scrolled through each page and had a great conversation around why we chose each shape. It was interesting, when I disagreed with her, choosing a different shape for a different reason, she was pretty willing to go along with my idea. I asked her, "Who's right?" and she quickly said, "You must be, I guess!" It took a few pages of convincing her that we could both be right and by the end it was a bit of a game to see just how different our thinking could be. I especially appreciate the developmentally specific prompts given in the post so families and teachers can use the book with varying age groups. I've included some additional supplemental pages on my Downloads page if you want to add to the book. When I printed the PDF the pages came out, with a border, to be a 7 3/4 square so I tried to size my supplemental pages to fit the originals. Please take the time to read more posts from Talking Math with Your Kids. So many goodies!

Fire and Ice in Winter's Darkness

Winter, dark and grey outside, sideways rain quite often. A burning hearth with crackling sounds coming through my computer screen. Somehow that ”real” glow of the video fire started me down the path to ”Fire and Ice” a series of Temari. 34 more words


Book: Pure Geometry, Askwith, 1911

So, I buy books to look for ideas, and I buy books for my “collection” of old maths texts. Every so often, I find a book on eBay which is *more* than just an old text book, like this one. 180 more words

Thoughts And Ramblings