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Playlist: Bookmarks

Crossing Every Bridge Exactly Once (aka Eulerian Paths)

How can you cross each bridge in this city exactly once?

Math Curiosity: Magic Triangles

Can you make each side of this triangle add up to 9 using the digits 1-6?

Special Gifts with Special Requirements

Your special friends sure have some unique gift needs!

Writing Differentiated Lesson Objectives

For Teachers

My early lessons didn’t even have objectives, let alone good objectives! Here’s how to build four-part, differentiated lesson objectives.

Student Introductions With Depth and Frames

Want to introduce the tools of Depth and Complexity and learn more about your students and introduce the Frame graphic organizer? Have I got the activity for you!

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?

A Donut Investigation

In this cross-curricular investigation, students will look into an intriguing question: do donuts or salads have more sugar? They’ll grapple with misleading information, bias, and use their math skills to create a visual representation of sugar in popular foods.

Showing A Character’s Trait

We tell students to ‘show, not tell’ — but that advice is useless until they experience the difference. This lesson makes it click.

Math Curiosity: Waring’s Conjecture

So, can you write every odd (greater than 3) as the sum of three primes?

Math Curiosity: Twin Primes

What do you call two prime numbers who are very close together?

Curriculum Compacting

For Teachers

Shrink the curriculum down to what students actually need to learn. Then use the freed-up time for something better.

Math Curiosity: Palindromic Number Conjecture

Using this one weird trick, it seems that you can turn any number into a palindrome!

Math Curiosity: Collatz Conjecture

The Collatz Conjecture: start with any number and get to 1 using just two rules. It seems to always work…

Ethics In The Young Elementary Classroom

For Teachers

Can kindergartners discuss ethical issues? Yes. Here’s how to weave multiple-perspective problems throughout your curriculum.