In the early stages of education, students need to understand the importance of labels in math word problems. Students should be disciplined to always label their answers.
This exercise introduces the importance of using numbers with the proper label to ensure that the answer is arrived at correctly.
The follow-up exercise to this is "Math Word Problems- Solving by Labels." For late 5th Grade through Adult Education, the idea of solving problems by looking at the labels and the label of the answer allows solving problems without having knowledge of an equation- just basic operations and operations involving fractions.