I use one of these a week with my math students to maintain skills. They can choose which row or column they do each day, so that they can be finished by the end of the week. This is aligned with common core standards (identified in each box).I pretty much go in order when introducing skills, though there are some skills I build up to by teaching some of the sub-skills ahead of time, so it might seem a bit odd, but it should give you a good place to start.
The purpose of this activity is to maintain the skills we have already covered in class, so they may not be the most challenging level, but it is good repetition. I have found this system to be very successful for skill maintenance.