What’s In My Brain: H vs Arrow

Two columns. One is an example, one isn’t. Can you figure out the hidden rule before the big reveal?

What’s In My Brain: Pentagon vs Pentagon

We’re looking at regular vs irregular polygons.

Grouping Shapes by Parallel and Perpendicular Sides

Which shapes go together based on parallel and perpendicular lines?

Letters With Symmetry

Let’s group letters by their symmetry, then create symmetrical words, and then symmetrical sentences!

Geometry Image: Esplanade Theaters

What odd and interesting shapes can your students find in this geometric image?

Geometry Image: University Ave

What odd and interesting shapes can your students find in this geometric image?

Geometry Image: Victoria Conference Center

What odd and interesting shapes can your students find in this geometric image?

Geometry Image: Skytree

What odd and interesting shapes can your students find in this geometric image?

Geometry Image: Steigerwald

What odd and interesting shapes can your students find in this geometric image?

Numerator or Denominator: Which has more power in a fraction?

What do you do with students who already get their fraction operations? Give them a contrived project about recipes or pizza slices? Make them solve annoyingly hard practice problems? Please. Here, we get students thinking in a whole new way, pondering which has more power, the numerator or denominator.

What’s In My Brain: Trapezoids or Not?

Which are trapezoids and which are not?

Intersecting Angles and Streets

There can never be just one angle.

Math Curiosity: The Coloring Problem

No video gets me more email from students! How few colors can you use to color in any map so that no two, neighboring regions are the same color?

The Angles of a Triangle

Why tell a kid the rules of a triangle when they can discover them!?

Grouping Quadrilaterals In A Hierarchy

Can we classify quadrilaterals like we classify living things?

Deducing the Area of Triangles

Using patterns, students try to deduce where that area formula came from.

Discovering Pi With Sticky Notes

Pi is mysterious and strange! Why not let students discover it on their own?

Exploring Circumference With Famous Circles

Let’s find how the diameter and circumference of famous circles are related.