- Determine the two consecutive multiples of 10 that bracket 3,421
- 3,421 is between 3,420 and 3,430
- 3,425 is the midpoint between 3,420 and 3,430
- As illustrated on the number line, 3,421 is less than the midpoint (3,425)
- Therefore, 3,421 rounded to the nearest ten = 3,420
