The Eides wrote about this in their Dyslexic Advantage book. Some kids really learn math backwards - they know the answers and sometimes it takes them until their teen years to understand and work out how they got the answers. They believe that kids like this should not be penalized for not showing their work. Also, many kids have been ruined by teachers and others with the attitude that they must show their work. They said that they see kids with near perfect scores on the arithmetic section of the WISC IV that are failing math and hate it because they truly cannot show their work yet.
Brains are wired differently and we should applaud the strengths of differences.
