Why must the eliminating entries be entered in the consolidation worksheet each time consolidated statements are prepared?

The employee is asking you to respond to the following questions. Please provide full explanations and use examples to support your work.

1. Why must the eliminating entries be entered in the consolidation worksheet each time consolidated statements are prepared?
2. How is the beginning-of-period noncontrolling interest balance determined?
3. How is the end-of-period noncontrolling interest balance determined? Provide an example.
4. Which of the subsidiary’s account balances must always be eliminated? Why?
5. Which of the parent company’s account balances must always be eliminated? Why?