Annotating photos

Last night I got to thinking about ways that students can either identify steps or explain what they did when they solved a problem.  The group of students I work with are students who are classified as ELL (English Language Learners) and they hate to write.  So my idea is to have them work a problem, snap a screenshot, annotate the photo and send the photo to me or put it in a Dropbox.

I used the free drawing app to create the equation and then added the steps using Typic plus which is the paid version but there is a free version.  I think students would be more willing to do this type of writing rather than doing it on paper.