Mathematics for IGCSE & O level - Using A Calculator (Section 1 - No. 22)
What do you need to do after you have written the answer into a calculator?
You must round your answer to the correct significant figures
You can round the answer to any significant figures you want
You need not round the answer
You should round to 1 significant figure.
Paliwanag
The answer must be rounded to the correct significant figures