- Determine the two consecutive multiples of 10 that bracket 21,651
- 21,651 is between 21,650 and 21,660
- 21,655 is the midpoint between 21,650 and 21,660
- As illustrated on the number line, 21,651 is less than the midpoint (21,655)
- Therefore, 21,651 rounded to the nearest ten = 21,650
