The sum of \( 9 + 9 \) is \( 18 \).

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Here are 5 related questions to explore further:

1. What is the sum of \( 18 + 9 \)?
2. What is the result of \( 9 \times 9 \)?
3. How does addition relate to multiplication?
4. Can you express \( 18 \) as a sum of two other numbers?
5. What is the sum of \( 9 \) and a negative number, say \( 9 + (-5) \)?

**Tip:** When adding two identical numbers, you can think of it as multiplying the number by 2, i.e., \( 9 + 9 = 2 \times 9 \).

Learn how to solve the simple addition problem 9 + 9. This basic arithmetic operation demonstrates how identical numbers can be added together, and the solution can also be expressed as multiplying by 2. Suitable for students in Grades 1-3.

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