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The question asks to find the combined population of Singapore and Belgium in standard index form.

- **Singapore's population** is \( 5.7 \times 10^6 \).
- **Belgium's population** is \( 1.1 \times 10^7 \).

### Step 1: Adding the two populations
We need to combine the two numbers. Since they have different powers of 10, we can convert them to the same power.

First, rewrite the population of Singapore with a power of \( 10^7 \):

\[
5.7 \times 10^6 = 0.57 \times 10^7
\]

Now, add this to Belgium's population:

\[
0.57 \times 10^7 + 1.1 \times 10^7 = (0.57 + 1.1) \times 10^7 = 1.67 \times 10^7
\]

### Final Answer:
The combined population of Singapore and Belgium is \( 1.67 \times 10^7 \).

Let me know if you need further details or have any questions! Here are five related questions to expand your understanding:

1. How do you multiply numbers in standard index form?
2. How can we convert between different powers of 10 more efficiently?
3. What are some real-world uses of standard index form?
4. How would you subtract two numbers in standard index form?
5. Can standard index form be used with very small numbers (e.g., \( 10^{-3} \))?

**Tip:** When adding numbers in standard index form, always make sure they have the same powers of 10 before combining them!

The approximate populations of Singapore and Belgium are given in standard form (Singapore: 5.7 × 10^6, Belgium: 1.1 × 10^7). Calculate the combined population in standard index form.

Learn how to calculate the combined population of Singapore and Belgium using scientific notation. This problem involves converting numbers into a common power of 10 and then adding them, resulting in 1.67 × 10^7. Perfect for students in Grades 6-8 learning how to work with standard index form.

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