rules in rounding off numbers

Rules in rounding off numbers

(1) If the rightmost digit to be removed is more than 5, the preceding number is increased by one.

Example 1.386 If we have to remove 6, we have to round it to 1.39

(2) If the rightmost digit to be removed is less than 5, the preceding number is not changed. 

Example, 4.334 if 4 is to be removed, then the result is rounded upto 4.33.

(3) If the rightmost digit to be removed is 5, then the preceding number is not changed if it is an even number but it is increased by one if it is an odd number. 

Example, if 6.35 is to be rounded by removing 5, we have to increase 3 to 4 giving 6.4 as the result. However, if 6.25 is to be rounded off it is rounded off to 6.2.