Given : 55.7796
To Find : rounded off to 3 decimal places
Solution:
55.7796
To round off to 3 decimal places need to check digit at
4th decimal place
if digit is 5 or greater than 5 then digit at 3rd decimal place has to be increased by 1 and all decimal places after that to be removed
if digit is less than 5 then digit at 3rd decimal place remains same and all decimal places after that to be removed
55.7796
Digit at 4th decimal place is 6 which is greater than 5
Hence digit at 3rd decimal place has to be increased by 1
9 + 1 = 10 Hence 1 to be carried forward to digit at 2nd decimal place
7 + 1 = 8
Hence number rounded off to 3 decimal places is
55.780
55.7796 rounded off to 3 decimal places is 55.780