- Determine the two consecutive multiples of 100 that bracket 3,123
- 3,123 is between 3,100 and 3,200
- 3,150 is the midpoint between 3,100 and 3,200
- As illustrated on the number line, 3,123 is less than the midpoint (3,150)
- Therefore, 3,123 rounded to the nearest hundred = 3,100
