How do you round 2,301 to the nearest hundred?
As we are considering the hundreds the 'cut off point' is between hundreds and tens. You will understand what I mean as we go along.
The digit just to the right of the cut of point is 0.
If this fits the condition 'less than 5', which it does, we do not change the digit to the left of the cut off point ( the 3) but change all the digits to its right into 0's giving:
Suppose the number had been
The digit to the right of the cut off point fits the description of '5 or more'.
This time we increase the 3 by 1 and then write all the digits to the right as 0 giving: