Q: What is the negative version of the number 644,637,408?
A: -644,637,408
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:
| 644,637,406 | 644,637,407 | 644,637,409 | 644,637,410 |
| -644,637,406 | -644,637,407 | -644,637,409 | -644,637,410 |