Final answer:
Letty is using the strategy of creating subgoals, which involves breaking down a complex problem into smaller, manageable steps, a common problem-solving strategy.
Step-by-step explanation:
Letty is employing the strategy of creating subgoals to solve a very complex problem by breaking it down into smaller, more manageable problems. This method is a common problem-solving strategy used to make a large and overwhelming task feel more approachable and achievable. For instance, when tackling a large research project or writing a long essay, students might brainstorm, research their topic, organize information into an outline, and write drafts sequentially to eventually complete the project. This strategy ensures each step is manageable and contributes towards the end goal effectively.