The sum of $2 + 4$ is:

$2 + 4 = 6$

Would you like more details or have any questions? Here are some related questions you might find interesting:

1. What is the sum of 7 and 3?
2. How do you add fractions?
3. What is 10 minus 4?
4. Can you explain the properties of addition?
5. How do you solve $2x + 4 = 10$?

Tip: When adding numbers, it's helpful to line them up vertically by place value to avoid mistakes, especially with larger numbers.