High School

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Simplify the expression:

\[ 99 + 99 + 99 + 99 + 99 + 99 + 99 + 99 + 99 + 9 \]

Answer :

- Rewrite the expression as $9 \times 99 + 9$.
- Calculate $9 \times 99 = 891$.
- Add 9 to the result: $891 + 9 = 900$.
- The final answer is $\boxed{900}$.

### Explanation
1. Problem Analysis
We need to find the sum of nine 99s and one 9. This can be written as $99+99+99+99+99+99+99+99+99+9$.

2. Rewriting the Expression
We can rewrite the expression as $9 \times 99 + 9$. This simplifies the calculation.

3. Multiplication
First, let's calculate $9 \times 99$. This equals 891.

4. Addition
Now, we add 9 to the result: $891 + 9 = 900$.

5. Final Answer
Therefore, the sum of nine 99s and one 9 is 900.

### Examples
Imagine you're collecting donations for a charity. Nine people donate $99 each, and one person donates $9. To find the total amount collected, you can use the same calculation: $9 \times 99 + 9 = 900$. So, the charity collects a total of $900.

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