What is the sum of 9 and 9?
Understand the Problem
The question is asking for the sum of two numbers, 9 and 9, which requires a simple mathematical addition.
Answer
$18$
Answer for screen readers
The final answer is $18$.
Steps to Solve
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Identify the Numbers The problem states to add the numbers 9 and 9.
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Set Up the Addition We can set up the equation for addition as follows: $$ 9 + 9 $$
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Perform the Addition Now perform the addition of the two numbers: $$ 9 + 9 = 18 $$
The final answer is $18$.
More Information
The sum of two identical numbers like 9 and 9 is straightforward. Adding the same number together is equivalent to multiplying the number by 2, so $9 + 9 = 2 \times 9 = 18$.
Tips
- A common mistake can occur if someone confuses the operation and performs subtraction instead of addition. Remember to always check that you are adding the correct numbers.
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