Q: What is the negative version of the number 644,421,238?
A: -644,421,238
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:
| 644,421,236 | 644,421,237 | 644,421,239 | 644,421,240 |
| -644,421,236 | -644,421,237 | -644,421,239 | -644,421,240 |