Launch the LiveSlides app.
Open a presentation in Keynote.
Go to the Khan Academy website.
Navigate to the page you'd like to present.
Copy the URL from your browser.
Paste the URL into the LiveSlides dialog and click "Insert".
A new slide with a placeholder image will appear at the end of your presentation. Drag the slide to where you'd like to display the web content.
Click the Play button to view the live web content in presentation mode.
Choose your operating system for instructions on inserting Khan Academy into PowerPoint on Windows or Mac.