Q: What is the negative version of the number 644,663,000?
A: -644,663,000
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:
| 644,662,998 | 644,662,999 | 644,663,001 | 644,663,002 |
| -644,662,998 | -644,662,999 | -644,663,001 | -644,663,002 |