Roshan is a fourth grader who is being evaluated for poor scholastic performance in mathematics. he has always been a happy, healthy child, has socialized with friends at school, and presents no behavioral concerns at home. however, his math performance has always been below the average for his grade, and now he is performing so far below his peers that he is really beginning to be upset about it. while being evaluated for a learning disorder, the pmhnp appreciates that roshan has had a marked deficit in his ability to recognize and understand symbols and order clusters of numbers. this suggests a deficit in: