- Determine the two consecutive multiples of 1,000 that bracket 4,121
- 4,121 is between 4,000 and 5,000
- 4,500 is the midpoint between 4,000 and 5,000
- As illustrated on the number line, 4,121 is less than the midpoint (4,500)
- Therefore, 4,121 rounded to the nearest thousand = 4,000
