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

Would you like more details or have any questions? Here are five more questions you might want to ask:

1. How do you solve quadratic equations?
2. What is the derivative of $x^2$?
3. Can you explain the Pythagorean theorem?
4. How do you integrate $\int x \, dx$?
5. What is the value of $\pi$?

Tip: Always double-check your calculations for simple arithmetic to avoid mistakes.