The sum of $2 + 4$ is $6$.

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Here are 5 related questions to expand on this topic:

1. What is $3 + 7$?
2. How do you add larger numbers, such as $123 + 456$?
3. Can you explain the properties of addition?
4. What is the result of $5 + 8 + 2$?
5. How does addition work with negative numbers, such as $2 + (-4)$?

Tip: When adding numbers, you can group them in any order due to the commutative property of addition.