To round 212.809 to the nearest hundredth:

1. Identify the hundredth place: The digit in the hundredth place is 0.
2. Look at the next digit to the right (thousandths place): The digit here is 9.
3. Since the next digit (9) is 5 or greater, round up.

Thus, 212.809 rounded to the nearest hundredth is 212.81.

Would you like more details or have any questions? Here are five related questions:

1. How do you round numbers to the nearest tenth?
2. How is rounding used in real-life measurements?
3. What is the difference between rounding up and rounding down?
4. How would you round 212.805 to the nearest hundredth?
5. What is the rule for rounding when the next digit is exactly 5?

Tip: When rounding to a specific place value, always look one place to the right to decide whether to round up or keep the digit the same.