What fundamental concept is reinforced when learning about percentages in Module 4?

The concept that percentages are directly related to basic decimal concepts is reinforced in Module 4 because percentages can be understood as a specific type of decimal representation. Specifically, a percentage represents a number out of 100, which means that understanding how to convert between fractions, decimals, and percentages is crucial for performing calculations involving them. For instance, 50% can be expressed as 0.50 in decimal form, highlighting the intrinsic connection between these concepts. This relationship fosters a deeper understanding of how to manipulate numbers in different forms, making it easier to solve real-world problems involving rates, ratios, and proportions. Recognizing this link is essential for developing a comprehensive grasp of mathematical relationships and their applications.