- Determine the two consecutive multiples of 10 that bracket 12,643
- 12,643 is between 12,640 and 12,650
- 12,645 is the midpoint between 12,640 and 12,650
- As illustrated on the number line, 12,643 is less than the midpoint (12,645)
- Therefore, 12,643 rounded to the nearest ten = 12,640
