1 plus 1 equals 2.

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Here are 5 related questions to expand on this:

1. What is the sum of 2 plus 2?
2. What is 1 plus 1 squared?
3. How does addition differ from multiplication?
4. What happens when you add negative numbers, like -1 plus 1?
5. Can you explain the commutative property of addition?

Tip: Addition is a basic operation that is both commutative (changing the order doesn't affect the result) and associative (grouping numbers doesn't affect the result).