This blog post series is about geometric constructions using a tool that is two long parallel straight edges, basically exactly like a physical ruler, except without any marks to measure lengths wi…

こんにちは、平野たいる（@tairu_mk）です。 前回の記事は、初投稿ながら想像を遥かに超える反響をいただき、ありがとうございました。本稿において前提としている部分もあるため、未読の方はそちらを先に読んでいただけますと幸いです。 また、前回の記事がきっかけとなり、arXivに投稿した論文の解説記事がITmediaに掲載される運びとなりました。重ねてありがとうございます。 日本の会社...

A fourth-grade window seat to line plots and dot paper fractions

A low-tech task with high-level thinking

One of my favorite courses to teach is our embedded elementary whole number and operation teacher prep course. Typically they teach every co...

Inspired by the Archimedes Trammel, we present to you Elipso. A solid brass, scalable ellipse drawing tool.

Some experts predict that A.I. will surpass human intelligence within the next few years. Play this puzzle to see how far the machines have to go.

Alabama is the only state where 4th-grade math scores are higher now than they were in 2019, before the pandemic. This is the story of how the state pulled it off.

Using Dynamic Technology to Build Understanding ◊ Episode 5: Marvelous Midsegments ◊ Welcome to Episode 5, where we take the scenic route in our geometry journey. What happens when we find midpoint…

CMYK’s new collection of card games. In a world of increasing digital distractions, Magenta is set to revive a classic way we gather and play – making face-to-face connections through card game nights...

A selection from Proof and the Art of Mathematics

Folks wrung their hands a lot this year about reading. "No one buys books," Elle Griffin argued this spring, although apparently Bible sales are surging, as – according to The Washington Times at leas...

Landmark results in geometry and number theory marked an exciting year for mathematics, at a time when advances in artificial intelligence are starting to transform the subject’s future.

This will be the last Friday you'll receive a Second Breakfast newsletter in 2024. I'm not writing my usual "year-in-review" series either, as easy as it could have been to just copy-and-paste "artifi...