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Write the Hindu-Arabic numeral for the following Roman numeral: 

$\mathrm{DCCCXXV}$

Write the Hindu-Arabic numeral for the following Roman numeral: 

$\mathrm{MDCXLIV}$

Write the number names of $3,04,80,594$ in the Indian system of numeration as well as in the international system of numeration.

Give a rough estimate as well as a closer estimate for the following:

$3793+415$

Give a rough estimate as well as a closer estimate for the following:

$9452-394$

The length of a rope is $5 \mathrm{m} \mathrm{and} 20 \mathrm{cm}$. If it is cut into equal pieces of $26 \mathrm{cm}$, how many pieces will be there?

The length of a rope is $5 \mathrm{m} \mathrm{and} 20 \mathrm{cm}$. If it is cut into $20$ pieces of equal length, what will be the length of each piece?

A fruit seller bought $25$ baskets of oranges, each containing $120$ oranges. At the time of repacking, he found that $725$ oranges were not in good condition. If the remaining oranges were packed into small boxes containing $25$ oranges each, how many boxes were there?