The decimal equivalent of $\frac{1}{20}$ up to three significant figures is

The radius of a circle is $2.12 \ m$. Its area according to the rule of significant figures is ......... $m^2$.

The volume of a sphere is $1.76 \ cm^3$. The volume of $25$ such spheres,taking into account significant figures,is:

The length,breadth,and thickness of a metal sheet are $4.234 \; m$,$1.005 \; m$,and $2.01 \; cm$ respectively. Then the area and volume of the sheet are:

What points should be considered during the multiplication and division of numbers with significant figures?

Taking into account the significant figures,what is the value of $9.99\, m - 0.0099\, m$ (in $, m$)?