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MathXplosion, Ep 20: Crack an ancient Roman code

Decrypt the ancient cipher box used by Julius Caesar over 2,000 years ago! By shifting the alphabet or replacing one letter for another further down the alphabetical sequence, you can crack a coded message. The secret to a cipher is one special piece of shared information, known as a key. This shared key is required for ...

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MathXplosion, Ep 48: The most important thing when solving word problems

It's very important to read problems carefully so you can determine the important facts and understand the questions you are being asked to solve. You may find an answer using pictures and numbers, but if you didn’t answer the right question, what seems right can actually be wrong.

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Unplugged Activity: Graph Paper Programming

This video introduces one of code.org's unplugged activities and provides an introduction to programming without the use of computers. One student takes on the role of "programmer", drawing arrows and scribbles on paper to guide the other student to re-create a particular picture. For more information on the activities ...

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Hour of Code: Saloni teaches If/Else statements with Scrat the Squirrel from Ice Age

The Hour of Code is a one-hour introduction to computer science, designed to demystify code and show that anybody can learn the basics. In this video, Saloni explains what an If/Else statement is. With the help of Scrat the Squirrel from Ice Age, she goes on to demonstrate how If/Else blocks can be used to program characters' ...

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Unplugged Activity: Computational Thinking

This video introduces one of code.org's unplugged activities. It discusses a lesson on Computational Thinking, designed to show you how to take a big difficult problem and turn it into several simpler problems. The goal of the lesson is for a group of students to write a set of instructions for another group of students ...

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Hour of Code: Introduction

The Hour of Code is a one-hour introduction to computer science, designed to demystify code and show that anybody can learn the basics.  This video explains what computer science is and what a computer programmer does. This is the first of seven clips in the Hour of Code tutorial. To try your hand at coding visit learn.code.org

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Unplugged Activity: What is computer science?

Do you know what a computer programmer does? Watch as some experts in the field explain. For more information on the activities introduced in this video, visit http://learn.code.org/s/1/level/1

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Introducing algorithms

In this sequence of lessons, students design a sequence of steps for others to follow. They convey their instructions to peers and evaluate the work of others to determine if the outcome was successful.