The Correct Answer and Explanation is:
The correct answer is D) 252 mm.
To convert centimeters to millimeters, you use the basic metric conversion factor that 1 centimeter equals 10 millimeters. This means you’re simply multiplying the number of centimeters by 10 to find the equivalent in millimeters.
Starting with 25.2 centimeters:
25.2 × 10 = 252 millimeters
The metric system was specifically designed to be straightforward and intuitive. Every unit in the metric system changes by a factor of ten, which allows conversions to be handled easily by moving the decimal point. In this case, multiplying by 10 shifts the decimal point one place to the right.
Let’s explore why the other options are incorrect:
- Option A (2.52 mm) mistakenly moves the decimal two places to the left, which would be the correct move if converting from millimeters to centimeters—not the other way around.
- Option B (0.0252 mm) moves the decimal three places left, resulting in a drastically smaller value than intended.
- Option C (0.252 mm) is closer to A but still reflects the error of treating the conversion backwards.
Precision in unit conversions is critical across many contexts. Whether measuring dimensions in construction, calculating dosage in healthcare, or analyzing distances in scientific research, the ability to convert values accurately ensures consistency and avoids costly mistakes. Mastering metric conversions also helps students build mathematical confidence, especially in applying ratios and proportions practically.
In summary, you multiply centimeters by ten to get millimeters. Since 25.2 × 10 = 252, the correct answer is 252 millimeters. This approach illustrates how a simple understanding of metric relationships can make seemingly complex conversions remarkably easy.
