Alone with my syllabus, I include a spreadsheet that shows the exact breakdown of their grades. I also send it via email to each student so they can see how their grades are calculated. Every day in class I request that the student list on their spread sheet their daily grades including if they were late and if they were absent. At the end of the Mod, I speak to each student individually and compare my notes with their notes. Students know what their grades are and their attendances at all times. So when they check their portal and it is a double check that everything has been posted correctly.