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To solve this problem, let’s go through the unit conversion and then express the result in scientific notation.

1. **Convert kilograms to milligrams:**
   - We know that:
     \[
     1 \text{ kg} = 1,000,000 \text{ mg}
     \]
   - So, to convert \( 0.004 \text{ kg} \) to milligrams:
     \[
     0.004 \text{ kg} \times 1,000,000 \text{ mg/kg} = 4000 \text{ mg}
     \]

2. **Express in scientific notation:**
   - \( 4000 \) mg can be written in scientific notation as:
     \[
     4 \times 10^3 \text{ mg}
     \]

### Final Answer:
\[
4 \times 10^3 \text{ mg}
\]

Would you like a detailed explanation, or do you have any questions?

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Here are five related questions to expand your understanding:

1. How would you convert from kilograms to grams instead of milligrams?
2. What would the answer be if we needed the result in micrograms?
3. How would you convert from milligrams to kilograms?
4. How do you determine the exponent in scientific notation for any given number?
5. Can you explain why scientific notation is useful for very large or very small numbers?

**Tip:** When converting units, always identify the intermediate steps clearly to avoid mistakes, especially when moving between units that differ by powers of 10.

Convert 0.004 kilograms (kg) to milligrams (mg) and express the result in scientific notation.

Learn how to convert 0.004 kilograms (kg) to milligrams (mg) and express the result in scientific notation. This problem covers unit conversion and scientific notation, suitable for students in Grades 7-9.

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