Estimate the value of the following to the nearest to one decimal place.

$\sqrt{90}$.

Estimate the value of the following to the nearest to one decimal place.

$\sqrt{150}$.

Estimate the value of the following to the nearest to one decimal place.

$\sqrt{600}$.

Estimate the value of the following to the nearest whole number:

$\sqrt{1000}$

Devika has a square piece of cloth of area $9 {\mathrm{m}}^2$ and she wants to make $16$ square-shaped scarves of equal size out of it. What should possibly be the length of the side of the scarf that can be made out of this piece?

The area of a square plot is $800 {\mathrm{m}}^2$. Find the estimated length of the side of the plot. 

Priya wants to wish her teacher on Teacher's Day by giving her a self-made greeting card. She chooses a pink coloured square sheet of paper. A side of that paper measures $19.5 \mathrm{cm}$. Find the area of paper she chooses for the card.

Priya wants to wish her teacher on Teacher's Day by giving her a self-made greeting card. She chooses a pink coloured square sheet of paper. What act of Priya did you like? 

The students of Class-VIII B of a school donated $₹2304$ for the Prime Minister's National Relief Fund. Each student donated as many rupees as the number of students in the class. Find the number of students in VIII B.