The "Problem of the Day" is probably one of my favorite routines for the classroom! I ended up starting this routine as prep work for the story problems that are on the Kindergarten IOWA test... and my kids just love it!
I know a lot of teachers do math journals with their kids, which is somewhat similar. I have thought about doing those, but unfortunately the IOWA Test doesn't allow for students to use scrap paper to solve their math problems, so I use my problem of the day to focus on counting with our fingers.
This routine is aligned to CCS:K.OA.1 and CCS:K.OA.2.
Read more about this routine here:
Obviously that blog post refers to the April set, the only different with this set is that it includes both addition and subtraction stories to help you class work on determining whether they should add or subtract.