You’re offline. Practice still works and is saved on this device; videos need a connection.

1.3 Practice

Watch Lesson 1.3 first. These use charts drawn from our own interviews, plus the lesson’s dot experiment. Ask for a hint whenever you want one.

Lesson 1.3 practice is free with an account

Sign in, or make a free account, to practice Lesson 1.3. Your progress is saved to your account, so it follows you to another device.

Learning on your own: accounts are for people 13 or older.
Students in a class: join with your teacher’s class code on the join page. You don’t need an account, and the questions appear right here.
Teachers and parents: make a free class dashboard account. Every student in your classes gets every lesson of Project 1.

Built your own sheet? Practice on your own data: paste it in and get questions worked out from your own numbers. Nothing is uploaded.