Q: What is the negative version of the number 643,521,409?
A: -643,521,409
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:
| 643,521,407 | 643,521,408 | 643,521,410 | 643,521,411 |
| -643,521,407 | -643,521,408 | -643,521,410 | -643,521,411 |