Someone on here said something a while back (there I go showing my NONphotographic NONmemory) to the effect that if a child who is in sixth grade because they are the chronological age to be in sixth grade was forced to sit and do 1st grade worksheets, they would act up, but people are surprised to find that a child who is capable of doing sixth grade work when he is 6 years old will act up when he has to do 1st grade worksheets.
If I had to sit and do 1st grade worksheets, I wouldn't think much of it, either. Or, in your case, 4th grade worksheets.
