Are the problems too close together? Make sure you can distinguish between the problem number and the actual problems. The problem numbers should be less obtrusive. Students with and without ADD and ADHD can become distracted by too many distractions!?
Are there too many problems on the page? Some authors attempt to pack in the problems, leaving little room for students to show their work. The opposite can also be the case. Maybe there are not enough problems to accurately assess student knowledge. Are the digits on the printed page large or small? In my opinion and within reason, the numbers can never be too large. Exhibiting stress at an early age on elementary studentsí eyes from staring at small print can lead to stronger prescription lenses.