The average aide salary at Cambridge Elem. was $48,750 , which is 111 percent higher than the average salary for this job in Missouri, and 51 percent higher than the national average for this job . Aide salaries at Cambridge Elem. typically range from $31,730 to $65,770 (25th to 75th percentile). The highest reported aide salary was $65,770. There are 2 employees at Cambridge Elem. with the job title aide.