The sum of $1 + 2$ is $3$.

Would you like more details or have any questions?

Here are some questions you might be interested in asking:

1. What is $2 + 3$?
2. How do you solve $x + 5 = 10$?
3. What is the derivative of $x^2$?
4. Can you explain the Pythagorean theorem?
5. What is the area of a circle with radius $r$?

Tip: When adding numbers, the order does not matter (commutative