Write the rules for determining significant figures.

Explanation

Rules for counting significant figures:


Note: 1 Multiplying or dividing factors, which are neither rounded numbers nor numbers representing measured values, are exact and they have infinite numbers of significant figures as per the situation.
For example, circumference of circle S = `2pir` , Here the factor 2 is exact number. It can be written is 2.0, 2.00 or 2.000 as required.
Note: 2 The power of 10 is irrelevant to the determination of significant figures.
For example x = 5.70 m = 5.70 `xx 10^(2) "cm" = 5.70 xx 10^(3) "mm" = 5.70 xx 10^(-3)` km.
In each case the number of significant figures is three.