As a veteran teacher you caught my attention. Common Core style and ADHD do not work well together. Too many steps are added to the cc style and usually by step 2 you have lost your ADHD child and by step 4 most of other students. I am not a fan at all of that style of teaching as a one and done style. Good teachers introduce various learning styles. Great teachers keep working until the child grasps the concept regardless of how they got there. What type of ADHD assessments are you referring to? I have filled out many through the years along with letters and phone calls with doctors. I wish you well. It breaks my heart to see a child not enjoy school because of the stupidity of adults. Unfortunately along the some in my profession forgot what are main focus is.
I love a good math discussion! Here are my thoughts on the issues with CCSS-M, a a parent of an ADHD child as well as an educator.
1. Implementation and testing have caused issues. Too many tests!
2. Curriculum that is chosen does not always align with student centered, problem based learning and can be very scripted and procedural. Making kids learn 7 ways to solve a problem is not student centered. It's teacher centered. Student invented strategies come from the student, with probing guidance from the teacher.
3. In my county, at least, there are inconsistencies with parent communication, which causes frustration about how parents are supposed to help their child with math.
The "cc" style of learning is a curriculum issue, imo, not a CCSS-M issue. The standards do not say a teacher must teach this way. The progression documents emphasize student invented strategies that are based on properties of operations and place value in grades 2 and 3, and then by grade 4 the traditional algorithm is used. Moving away from drill and kill and teaching for understanding should be the goal.
All these steps go against the NCTM Principles and Standards and the 8 SMP. Instead of having mathematically proficient students who have a balance between conceptual understanding, procedural fluency, and application of problem solving skills, we have kids memorizing steps. A child should be able to look at a problem and apply the strategy that works best in that situation. Sometimes it is the "old" way (traditional US algorithm), sometimes not. Other countries use different algorithms, which is always interesting to me. Student-centered, problem based learning is not new and is not a common core style.
I am not sure what state you are in or what you are seeing, but I feel that my county has a long way to go on this.