During multiplication and division, the answer should be written with the same number of significant figures as the operand with least significant figures.
However, while adding and subtracting, the answer should be written with same number of decimal places as the operand with least decimal places.
What is the reason for this difference? The problem is during adding and subtracting, sometimes the answer is more significant than the the operand having least significant numbers. Isn't that logically wrong?
(All the numbers I speak of above are physical measurements only.)