State the number of significant figures in each of the following numbers :
(i) 3.56 (ii) 35.6
(iii) 0.356 (iv) 0.0356.

Explanation

(i) 3.56 has three significant figures.
(ii) 35.6 also has three significant figures because decimal point does not determine the number of significant figures.
(iii) 0.356 has three significant figures.
(iv) 0.0356 also has three significant figures because the zero placed left to first non-zero digit is not significant.