Daum Equation Editor
From the Chrome Web store, search Daum Equation Editor and add.
Students can create equations and click save to drive.
Within a document in google drive, students will press insert image, choose from drive and click their equation which will then be added to their document.
Google docs does have an insert equation feature but presentations does not. Daum is an option for getting them there!
* If you are using a Mac, Daum is also available in the MAC store.