The sum of $12 + 5$ is:

$12 + 5 = 17$

Would you like more details or have any questions?

Here are 5 related questions you might find interesting:

1. What is $12 + 15$?
2. Can you solve $17 - 5$?
3. How would you solve $12 + 5 - 3$?
4. What is the result of $12 \times 5$?
5. How do you find the sum of $12 + 5 + 8$?

Tip: When adding numbers, it can help to break them down into smaller parts for easier mental math, especially with larger values.