Keep track of how many days of school using tally marks (up to 180 days).
My colleagues and I use the Tally Marks as part of a complete Calendar booklet, which the students do along with us during a SMART Notebook "Daily Calendar" file (in my TPT store). Parts of the booklet we have kids do: Calendar cover (Free in my TPT store), Calendar pages (in my TPT store), Temperature pages (use another set of calendars and record temperature and matching color), Days of School (Free in my TPT store), and Tally Mark page (Free).
(Works best with Primer Print font.)
Graphic from: http://wwww.mycutegraphics.com