@amandataintor , I teach statistics and use Speedgrader quite a bit. 
In my course we do a lot of work on the computer (using statistical software), so it's pretty easy for students to copy the results of their analysis and put it in a word document or Google Doc's. I then have them answer various questions about their analysis and the results. This final document is uploaded into Canvas where I can easily add my comments, suggestions, etc via Crocodoc. In addition, I've also had students write problems out by hand and then either take a picture with their phone and upload it to Canvas (easy to do using the mobile app) or convert it to pdf (they have free mobile ones) and submit it to a dropbox. In both cases it works great and I'm able to provide students feedback using Crocodoc (if turned in as a pdf).
Another way I use Canvas is for quizzes. We have all of our quizzes in Canvas and enjoy using the formula questions to create a large number of question options for the same question.
Yet, I'll be honest that in general, most math faculty find the quiz question interface (and functionality) to not be very effective for creating quiz questions and in some cases limiting.
Hope this helps!
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