Convert 30 millimeters to centimeters?
Understand the Problem
The question requires converting a measurement from millimeters (mm) to centimeters (cm). Since 1 cm equals 10 mm, you will need to divide the given millimeter value by 10 to find its equivalent in centimeters.
Answer
3 cm
Answer for screen readers
3 cm
Steps to Solve
- Identify the conversion factor
The conversion factor between millimeters (mm) and centimeters (cm) is: 1 cm = 10 mm
- Set up the conversion
To convert from millimeters to centimeters, divide the number of millimeters by 10.
- Perform the calculation
Divide 30 mm by 10 to get the equivalent in centimeters:
$$ \frac{30 \text{ mm}}{10 \text{ mm/cm}} = 3 \text{ cm} $$
3 cm
More Information
The prefix "centi-" means one hundredth, so a centimeter is one hundredth of a meter. The prefix "milli-" means one thousandth, so a millimeter is one thousandth of a meter. Thus, there are ten millimeters in a centimeter.
Tips
A common mistake is multiplying by 10 instead of dividing. Remember that a centimeter is a larger unit than a millimeter, so the number of centimeters will be smaller than the number of millimeters for the same length.
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