- Determine the two consecutive multiples of 1,000 that bracket 3,521
- 3,521 is between 3,000 and 4,000
- 3,500 is the midpoint between 3,000 and 4,000
- As illustrated on the number line, 3,521 is greater than the midpoint (3,500)
- Therefore, 3,521 rounded to the nearest thousand = 4,000
