Roman Numerals

If a new number is formed by interchanging the tens and thousands place digits of $8727$, then what is the relation between them?

State '$\mathrm{T}$' for true and '$\mathrm{F}$' for false.
I. Rounding off $2560$ to the nearest thousand, we get $2000$.
II. Place value of $9$ in $974304200$ is ninety crores.
III. $1$ lakh= $1000$ thousand
IV. Roman numeral for the smallest $4$-digit number is $\mathrm{M}$.

(i) The number  $825642$ rounded off to nearest thousand is $\mathrm{P}.$
(ii) Estimated product of $4023$ and $198$ is $\mathrm{Q}$.
(iii) $\mathrm{CXXXI}$ is written in Hindu-Arabic numeral as $\mathrm{R}$.
 

Raghu is $21$ years old and Kavita is $72$years old. The sum of their ages (in years) is_____.

Millions period consists of the places ______ .

The ascending order of  $\mathrm{X}\mathrm{X},\mathrm{}\mathrm{X}\mathrm{X}\mathrm{X}\mathrm{V}\mathrm{I},\mathrm{}\mathrm{V}$ is______

When a Roman numeral of smaller value is put between two numerals of greater value, it is subtracted from the numeral on its _______.