The result of $10 + 10 = 20$.

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Here are five related questions for you to explore:

1. What is $20 + 5$?
2. What is the result of $10 \times 10$?
3. What is $100 - 20$?
4. How do you calculate $10^2$ (10 squared)?
5. What is the sum of $10 + 10 + 10$?

Tip: When adding numbers, you can also break them into smaller parts to simplify mental calculations, like adding tens and units separately.