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Cost: Free

Ease of use: Easy to set-up, navigate, and implement in a math classroom

Type of tool: Interactive tool with standards-aligned online courses that cover math K-12

Functionality: Has practice problems that provide immediate feedback on skills, and short video lessons on each skill

Audience: K-12 Math

Multimedia learning principles supported: All 12 principles seem to be applied

I would use this resource to assign math skill exercises for students to practice after a lesson. It provides helpful feedback, with opportunities to brush up on a skill by watching a short video.

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Create an account: Go to khanacademy.org﻿ and click "Sign up".

Select a grade and subjects: Choose your grade and the subjects you want to study.

Students join a teacher's class: Go to the Teachers tab on your homepage. Students can join by email or class code. (My students logged in with Google, and type in the code)

Use the Mastery system: Khan Academy uses a personalized, mastery-based learning system. Students work on a concept until they master it.

Take a Mastery Challenge: Mastery Challenges are a way to review and practice skills you've previously learned. They consist of 6 questions that review 3 skills.

Students can use headphones or closed captioning: In the classroom, headphones can help students maintain focus. Students can also mute videos and use closed captioning.

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Students can practice graphing ordered pairs and receive immediate feedback. If they are struggling, there are interactive activities and videos for each skill.

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You can view students' progress as they complete each assigned skill, gauging their understanding. This can help you create small groups, or know when to re-teach a skill based on the data shown.