If you use iPads in your classroom.
Upload the Documents PDF files.
When the students open any of the files they will see a "Draw" tool in the upper right hand corner.
When they click it they will be able to write on the document with their finger or a stylus.
Here is Training: https://members.mathteachercoach.com/lessons/how-to-make-your-math-class-paperless-advanced-google-classroom-training/