The problem asks you to add $-98 + 0$.

When you add zero to any number, the number remains the same. Therefore:

$-98 + 0 = -98$

The result is $-98$.

Would you like more details or have any questions?

Here are 5 related questions to expand on this concept:

1. What happens when you add zero to any number?
2. How do you subtract a negative number from another negative number?
3. What is the difference between adding and subtracting negative numbers?
4. Can you explain how to add two negative numbers together?
5. How does adding zero affect an equation?

Tip: When working with negative numbers, it's helpful to visualize them on a number line to understand the direction of the operation.