Q: What is the negative version of the number 820,515,421?
A: -820,515,421
Negative numbers are usually written with - in front of them. They represent a number that is less than zero.
Here are more examples of negative numbers in sequence:
| 820,515,419 | 820,515,420 | 820,515,422 | 820,515,423 |
| -820,515,419 | -820,515,420 | -820,515,422 | -820,515,423 |