Practice question
Question
How many significant figures are there in the measurement 0.023080?
Explanation
Significant figures depend on least precise measurement. For 9.99 m (2 decimal places) minus 0.0099 m (4 decimal places), result 9.9801 m must be rounded to 2 decimal places as per subtraction rule in NCERT. So 9.98 m is correct, retaining 3 significant figures. Thus 3 follows significant figure rules.