Question

The value of $500.0m+600mm$ with due regards to significant figures is:

• A. $501m$
• B. $500.6m$
• C. $500.600m$
• D. none of these

Answer 1

The correct option is A $501m$

Rule: In addition or subtraction, the final result should retain as many decimal places as are there in the number with the least decimal places.
Arithmetic addition $=500.600m$
But least precise measurement $600mm$ is correct to zero decimal place.
So final result $=501m$