Sal discusses the conditions of matrix dimensions for which addition or multiplication are defined. Created by Sal Khan.

Through listing and observation, students identify the many texts that they read and compose: including books and magazines, television shows, movies, audio broadcasts, hypertexts, and animations.

This is a lesson plan to end a unit on Narrative.  During the unit, students came up with a time in their lives that was significant ("a defining moment") and will tell their stories digitally -- through a photo journal using Google docs. The lesson is a remix of Google's Applied Digital Skills lesson "Create a Photo in Google Docs".  

Savagery, treachery, lost innocenceÉ "Lord of the Flies" is rife with character development. Use this lesson to help students chart the character changes of Ralph and Jack, both in groups and individually.

The goal of this task is to critically analyze several possible definitions for parallel lines.

The purpose of this task is to critically examine some different possible definitions of what it means for two lines to be perpendicular.

The goal of this task is to compare and contrast the visual intuition we have of reflections with their technical mathematical definition.

The goal of this task is to encourage students to be precise in their use of language when making mathematical definitions.

The purpose of this task is to use the notion of similarity to define the sine and cosine of an acute angle.

In a series of three brief clips, Larry Kramer, Dean of Stanford Law School, provides some insights into understanding and teaching various details of the constitution.

Open Middle provides math problems that have a closed beginning, a closed end, and an open middle. This means that there are multiple ways to approach and ultimately solve the problems. Open middle problems generally require a higher Depth of Knowledge than most problems that assess procedural and conceptual understanding.

Open Middle provides math problems that have a closed beginning, a closed end, and an open middle. This means that there are multiple ways to approach and ultimately solve the problems. Open middle problems generally require a higher Depth of Knowledge than most problems that assess procedural and conceptual understanding.

Open Middle provides math problems that have a closed beginning, a closed end, and an open middle. This means that there are multiple ways to approach and ultimately solve the problems. Open middle problems generally require a higher Depth of Knowledge than most problems that assess procedural and conceptual understanding.

In this lesson, students will learn about the effects of deforestation and why people cut down trees. The will transfer the learned knowlede into a paragraph that includes a topic sentence, facts and details from the resources, and a concluding sentence. 

In this video segment adapted from ZOOM, cast members use a hair dryer to balance a ball in a stream of air, seemingly defying gravity.

In this video segment, the ZOOM cast is challenged to keep a ping pong ball in a funnel while the funnel is held upside down, seemingly defying gravity.

In this Cult of Pedagogy podcast, Kristy Louden offers some practical suggestions for teachers to use as they give feedback to student writing throughout the writing process. The goal in delaying the grade is to help students apply feedback rather than see it as a final assessment of their work.

In all, 70 delegates were appointed to the Constitutional Convention, but out of that 70 only 55 attended, and only 39 actually signed. Some simply refused, others got sick, still others left early.

Deliberate Practice refers to a special type of practice that is purposeful and systematic. While regular practice might include mindless repetitions, deliberate practice requires focused attention and is conducted with the specific goal of improving performance.