First, I just finished my President's Day Unit. I realize it's a bit late, I've been using parts of it over the last week and will finish it up with my kids next week. If you would like it you can find it here at Teachers Notebook and here at Tpt.
Ok, here's a math idea that I used with my kinders the other day to focus on addition. We're going to be starting addition folders soon (where they are timed) and we've been spending a lot of time on just learning the skills. I actually have a really great lesson/idea for it as well that I'll be posting later: Cookie Math. The kids love it! Until I have it finished though, this is another way to teach addition.