What is a significant difference in how the problems are structured in the problem-solving section?

The problems in the problem-solving section are often based on real-world scenarios, which is a significant aspect of how these problems are structured. This approach emphasizes the application of problem-solving skills in practical situations. By using real-world contexts, the questions encourage students to engage with the material on a deeper level, allowing them to see the relevance of the concepts they are learning.

This grounding in real-life applications can help learners better understand the importance of the problem-solving process and its impact in everyday situations. It also fosters critical thinking as students may need to consider multiple factors and perspectives to arrive at a solution that is not only mathematically valid but also contextually appropriate.

The other options focus on different aspects that do not encompass the primary structural characteristic of the problems. For instance, while visual aids can enhance understanding, they are not the defining feature of the problems. Also, the requirement for calculations varies from problem to problem and does not represent a unifying structure, nor can we say that all problems are theoretical since many incorporate practical applications.