Hi tanvi,

In significant figure for addition or substraction 

result will reported the same number of decimal place present in number with least decimal places

Here two values are 3.0223 and 5.041

3.0223 = have 4 digits after decimal

5.041 = have 3 digits after decimal (Least value)

3.0223 + 5.041 = 8.0633

Round of result will be 8.063 (with 3 digits after decimal)

Thanks for asking

Hope you got your answer

good day :)