Many of us have been using Google Voice Typing with Google Docs. It is now available in Google Slides also! Find it in the same location: under the Tools tab. It’s important to note that the Voice Typing will only input text into the Speaker Notes section, however a simple “copy + paste” will allow the text to be transferred to the slide. This can be a terrific solution for some students who struggle with writing, especially keyboarding and handwriting.
Find more information and “how to’s” at this link for Google Voice Typing Support.