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Try 'unplugged' computer science
I used the My Robotic Friends lesson with 3rd - 5th graders.
It is slow going but they LOVED becoming programmers and robots for this lesson. Since I only see each class for 40 minutes we still leave the class as beginners. But it was enough to get them excited about coding and eager to check out the Code.org website.
To encourage them even more to keep up with the Hour of Code after they left my class I offered extra points for any students who participated in activities on the website.
Recommendations for a class short on time: KISS! (Keep it Simple Silly)
The Binary Baubles lesson I taught to my K - 2nd graders.
Even Kindergartners were excited to learn code with this great lesson.
I did tweak it for the different ages to keep the lesson challenging enough to keep them interested but not too challenging to make the goal achievable.
Highlight of the day: Sit and Stand Binary Code! 2nd graders did really well the the binary code so I thought I would throw in some movement. I grouped teams of 9 students who had to form a letter based on the code. We made colored in boxes sit and empty boxes stand. One student stand in the middle of the line with their hand raised. This person is the space. The rest of the class has to figure out what letter they are as quickly as they can. This was the best activity of the day by far. I LOVED it!
Click the Hour of Code icon below for a direct link to their website.
Let's get these kids coding!