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The problem asks to solve the expression \((6.7 \times 10^7) - (4.2 \times 10^6)\) and to give the answer in standard form.

### Steps to solve:
1. **Rewrite both terms with the same power of 10**:
   - The first term is already \(6.7 \times 10^7\).
   - To subtract, convert \(4.2 \times 10^6\) to a power of \(10^7\):  
     \[ 4.2 \times 10^6 = 0.42 \times 10^7 \]

2. **Subtract the terms**:
   \[
   (6.7 \times 10^7) - (0.42 \times 10^7) = (6.7 - 0.42) \times 10^7
   \]
   \[
   6.28 \times 10^7
   \]

3. **Final answer in standard form**:  
   \[
   6.28 \times 10^7
   \]

Let me know if you'd like more details or explanations!

Here are some related questions you might find helpful:
1. How do you multiply numbers in scientific notation?
2. How do you convert numbers between scientific and standard form?
3. What is the purpose of using scientific notation?
4. How do you add or subtract numbers in scientific notation with different powers of 10?
5. Can scientific notation be used with very small numbers as well?

**Tip**: Always ensure that the numbers are written with the same power of 10 when adding or subtracting in scientific notation.

Work out (6.7 × 10^7) − (4.2 × 10^6). Give your answer in standard form.

Learn how to subtract numbers in scientific notation by solving the problem (6.7 × 10^7) − (4.2 × 10^6). Follow step-by-step instructions and express the answer in standard form. Suitable for Grades 9-11.

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