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!?
Maths worksheets should challenge students and at the same time should not be a scary subject to attempt. Worksheets are a recommended mathematic learning source and an amalgam of the total syllabi. They are the top priority in the education system and are used as a learning tool by many parents, schools, teachers and students.