Calculation of Significant Figures
Addition and subtraction:
In addition and subtraction the following points should be remembered
(a) Every quantity should be changed into same unit.
(b) If a quantity is expressed in the power of 10, then all the quantities should be changed into power of 10.
(c) The result obtained after addition or subtraction, the number of figure should be equal to that of least, after decimal point.
Multiplication and division
(a) The number of significant figures will be same if any number is multiplied by a constant.
(b) The product or division of two significant figures, will contain the significant figures equal to that of least.