The sum of $3 + 3$ is:

$3 + 3 = 6$

Would you like more details or have any questions about this?

Here are five related questions:

1. What is $3 \times 3$?
2. How would you subtract $3 - 2$?
3. What is $3^2$ (3 squared)?
4. Can you calculate $3 \div 3$?
5. What is the sum of $3 + 5 + 7$?

Tip: To quickly check simple addition, visualize the numbers on a number line!