To round 0.251 to 1 significant figure:

- The first non-zero digit is **2**, which is the first significant figure.
- The digit after the 2 is **5**, so we round the 2 up to **3**.

Thus, 0.251 rounded to 1 significant figure is **0.3**.

Would you like more details or have any questions?

Here are 5 related questions:
1. How do you round a number to two significant figures?
2. What is 0.00634 rounded to one significant figure?
3. How do you round numbers in scientific notation to significant figures?
4. Can you explain the difference between significant figures and decimal places?
5. Why is rounding important in scientific calculations?

**Tip:** When rounding to significant figures, always start counting from the first non-zero digit.

Learn how to round 0.251 to 1 significant figure. This problem covers key mathematical concepts, including significant figures and rounding rules. Understand how to apply rounding correctly for numbers with decimal places. Suitable for students in Grades 6-8.

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