The sum of 555,555 and 123,456 is:

**555,555 + 123,456 = 679,011**

Would you like further details or help with another problem? Here are some related questions you may find interesting:

1. What is the result of 678,912 + 111,111?
2. How do you perform long addition with large numbers?
3. What are some shortcuts for adding numbers quickly in your head?
4. How would you subtract 123,456 from 555,555?
5. What is the relationship between addition and multiplication?

**Tip:** When adding large numbers, it's helpful to break them down into smaller parts to make mental calculations easier (like adding hundreds, then thousands, etc.).

Learn how to add large numbers with this simple example: 555,555 + 123,456 = 679,011. This explanation covers basic addition techniques, useful for students in Grades 4-6.

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