Final answer:
The question does not provide enough information to determine the exact fraction of reported cases about children between the ages of four to seven.
Step-by-step explanation:
Child maltreatment in the United States is a significant issue, with millions of cases being reported each year. In 2010, there were approximately 700,000 reported cases of child maltreatment. To determine the number of cases involving children between the ages of four to seven, we need more specific data.
Unfortunately, the given information does not provide the exact number of cases in this specific age group. Therefore, we cannot determine the precise fraction of reported cases about children between ages four to seven.