The sum of $5 + 5$ is $10$.

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Here are five related questions to explore further:

1. What is $5 \times 5$?
2. What is $10 - 5$?
3. What is $5 + 5 + 5$?
4. How do you write $5 + 5$ in words?
5. What is the sum of $5$ and $5$ when represented as fractions?

Tip: When adding numbers, the order in which you add them doesn't matter. This is known as the commutative property of addition.