At school

Aresta #2

Innovamat

23/09/2025|8 min read

Aresta. Innovamat Newsletter

Where the Faces of Mathematics Education Meet

Hello! The monthly newsletter is back! 👋

This month, we’re thrilled to share that our curricular materials have been recommended by the State of California. What’s behind this achievement? 🌟

You’ll also get to join us inside math classrooms, read the full interview with Cecilia Calvo, download a visual ebook with all the strategies for basic operations… and much more! 🚀

Stepping into the Classroom

Building triangles from K to Secondary School

Imagine we give you these four line segments:

How many triangles do you think you could make? Maybe you’d start testing, combining them in different ways…

But is there any combination that doesn’t work? 🤔

Exactly! Not all of them work. To build a triangle, the sum of the lengths of the two shortest sides must be greater than that of the longest side.

You’ve just discovered the Triangle Inequality Theorem! 🙌 Step into the classroom and see how this concept is explored at different grade levels! 👇

Step into the classrooms!

The Tangram News

News, reflections, and key dates!

🌟Big news: Thinking Math!—our curriculum—has just been adopted by the California State Board of Education.

Hear from Dr. Peter Liljedahl

👉 How do we build basic operations in elementary school? Download this printable with all the strategies.

👉 What do we mean by mathematical richness? Albert Vilalta shares the key insights from his recent research.

👉 Don’t miss the story of our trip to NCTM 2025, one of the leading math education conferences in the U.S.

👉 This is Atlas Math, the evolution of individualized practice to boost learning even further.

Watch the video

👉 Isaac Sayol shows us how we design digital activities to practice known facts–derived facts.

👉 This was the Leadership Summit! The visit from Latin American school leaders who came to transform their schools.

Watch the video

The Class of my Life

A conversation about math education

“Mathematics is not a spectator sport: you have to get on the field and play.” — Cecilia Calvo

Don’t miss it!

The Library of Eratosthenes

Cultural recommendations for everyone

Eratosthenes, what do we find today in your library?

🏆This month we recommend the Bebras Computational Thinking problems! It’s a fantastic opportunity for your students to enjoy solving challenges that go far beyond simple operations.

📚 We will also find a book that invites us to rediscover the meaning of mathematics; the inspiring story of Ramanujan, the genius who showed how far passion for knowledge can go; and a deep reflection on the Big Ideas.