Final answer:
The standard section directly north of section number 16 contains 640 acres.
Step-by-step explanation:
The standard section directly north of section number 16 is the same size as a standard section, which is 640 acres. According to the information provided, sections are subdivided into quarter-sections, with each quarter-section being 160 acres. Therefore, the standard section directly north of section number 16 would contain the same amount of acres - 640 acres.