Rounding Off.

While rounding off measurements, we use the following rules by convention:

(1) If the digit to be dropped is less than 5, then the preceding digit is left unchanged.

Example : x=7.83is rounded off to 7.8, again x= 3.84 is rounded off to 3.8.

(2) If the digit to be dropped is more than 5, then the preceding digit is raised by one.

Example : x = 6.77 is rounded off to 6.8, again x = 12.88 is rounded off to 12.9.

(3) If the digit to be dropped is 5 followed by digits other than zero, then the preceding digit is raised by one.

Example : x = 16.352 is rounded off to 16.4.

(4) If digit to be dropped is 5 or 5 followed by zeros, then preceding digit is left unchanged, if it is even.

Example : x = 3.150 becomes 3.1 on rounding off.

(5) If digit to be dropped is 5 or 5 followed by zeros, then the preceding digit is raised by one, if it is odd.

Example : x = 3.650 is rounded off to 3.7.