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To convert \(3.98 \times 10^{-6}\) to standard (decimal) form, follow these steps:

### Step-by-Step Solution:
1. \(10^{-6}\) means moving the decimal point **6 places to the left**.
2. Start with 3.98. Moving the decimal 6 places left:
   - \(3.98 \rightarrow 0.00000398\)

Thus, \(3.98 \times 10^{-6} = 0.00000398\).

### Correct Answer:
The correct choice is: **0.00000398** (second option on the top row).

Do you have any further questions or need clarification? 

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Here are 5 related questions to expand your understanding:
1. How do you convert from scientific notation with positive exponents to standard form?
2. What is \(6.12 \times 10^4\) in standard form?
3. Why is scientific notation useful for extremely large or small numbers?
4. How do you convert from standard form back to scientific notation?
5. What is the difference between \(3.98 \times 10^{-6}\) and \(3.98 \times 10^6\)?

**Tip:** When working with scientific notation, remember that a **negative exponent** shifts the decimal to the left, while a **positive exponent** shifts it to the right.

Convert 3.98 × 10^(-6) to standard form.

Learn how to convert 3.98 × 10^(-6) to standard decimal form. This problem covers scientific notation, decimal shifting, and understanding exponents. Suitable for students in Grades 7-10.

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