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The problem asks to work out the expression:

\[
(8.9 \times 10^7) - (7.3 \times 10^6)
\]

### Step-by-Step Solution:

1. **Convert both numbers to the same power of 10**:
   - \( 8.9 \times 10^7 \) is already in terms of \( 10^7 \).
   - \( 7.3 \times 10^6 \) can be rewritten as \( 0.73 \times 10^7 \) to match the power of 10.

2. **Rewrite the subtraction**:
   \[
   (8.9 \times 10^7) - (0.73 \times 10^7) = (8.9 - 0.73) \times 10^7
   \]

3. **Subtract the numbers**:
   \[
   8.9 - 0.73 = 8.17
   \]

4. **Final result in standard form**:
   \[
   8.17 \times 10^7
   \]

So, the answer is **\( 8.17 \times 10^7 \)** in standard form.

Would you like any further details or explanations on any step?

Here are 5 relative questions:
1. How do you convert a number to standard form?
2. Why do we need to express numbers with the same power of 10 before performing operations?
3. What are some common mistakes when working with powers of 10?
4. How can you use scientific notation in real-life applications?
5. What are the advantages of using standard form for very large or very small numbers?

**Tip**: When adding or subtracting numbers in scientific notation, always ensure the powers of 10 are the same first.

Work out (8.9 × 10^7) − (7.3 × 10^6). Give your answer in standard form.

Learn how to subtract numbers in scientific notation by matching powers of 10. This detailed step-by-step solution breaks down (8.9 × 10^7) − (7.3 × 10^6), showing the final answer in standard form as 8.17 × 10^7. Perfect for students in Grades 9-11.

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