215 mm to cm
Understand the Problem
The question is asking for a conversion of a measurement from millimeters to centimeters. To solve it, we can use the conversion factor that 1 cm equals 10 mm.
Answer
The equivalent measurement in centimeters is $\frac{x}{10}$ cm, where $x$ is the number of millimeters.
Answer for screen readers
The equivalent measurement in centimeters is $\frac{x}{10}$ cm, where $x$ is the number of millimeters.
Steps to Solve

Identify the conversion factor To convert millimeters to centimeters, use the conversion factor: $1 \text{ cm} = 10 \text{ mm}$.

Set up the equation To convert a given measurement in millimeters (let's call it $x$ mm) to centimeters, use the formula: $$ \text{centimeters} = \frac{x \text{ mm}}{10} $$

Perform the calculation Insert the value of $x$ in millimeters into the equation and divide by 10 to find the equivalent centimeters.

Write the final answer Express the result in centimeters clearly, stating the conversion you've made.
The equivalent measurement in centimeters is $\frac{x}{10}$ cm, where $x$ is the number of millimeters.
More Information
This conversion shows how we can easily switch between units of measurement by using a simple ratio. This is particularly useful in any field involving measurements, such as architecture, engineering, and crafting.
Tips
 Forgetting the conversion factor: Always remember that there are 10 mm in 1 cm. If you use the wrong factor (e.g., trying to convert cm to mm instead), your answer will be incorrect.
 Not dividing correctly: When calculating, ensure you perform the division correctly to avoid errors.