The solution to $2 + 1$ is:

$2 + 1 = 3$

Would you like more details or have any questions?

Here are 5 related questions:

1. What is the result of $5 + 3$?
2. How do you solve $10 - 4$?
3. What is $7 + 2 + 1$?
4. What is the sum of $8 + 5$?
5. Can you solve $6 + 4 + 3$?

Tip: When adding numbers, start from the leftmost digit and proceed to the right, carrying over if necessary for larger sums.