Lots and lots and lots of ways! I'll give you my top 3:
1. Screencast-o-matic is a free Google add-on. It will come right in your toolbar and you can use It to record your desktop, a PowerPoint, etc. You can even choose for it to record your beautiful face while talking and not just serve as a voiceover!
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2. The CEO of Zoom is currently offering a free subscription. It's an app that allows for video conferencing, but you can also record yourself sharing your screen, a PowerPoint, etc. It's an AMAZING app!
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3. There is a recording feature in PowerPoint, itself. You can use this to do a voiceover of each slide and when the students go to play the PowerPoint as a slideshow, they will have a play button they will press to listen to you as you go through the slides. Select "slideshow" and then "record slide show."
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