- Determine the two consecutive multiples of 10 that bracket 4,521
- 4,521 is between 4,520 and 4,530
- 4,525 is the midpoint between 4,520 and 4,530
- As illustrated on the number line, 4,521 is less than the midpoint (4,525)
- Therefore, 4,521 rounded to the nearest ten = 4,520
