Explanation:

To solve the expression 0.0045 ÷ 4.5 × 100 - 45 ÷ 5, let's break it down:

- First, perform the division: 0.0045 ÷ 4.5 = 0.001.

- Now, multiply the result by 100: 0.001 × 100 = 0.1.

- Next, perform the second division: 45 ÷ 5 = 9.

- Subtract the second result from the first: 0.1 - 9 = -8.9.

Let's compare this to the given options:

- Option 1: -8.9

- Option 2: -9

- Option 3: -8.1

- Option 4: -9.9

The correct answer is Option 1: -8.9 .

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