Write the following Roman numerals as Hindu-Arabic numerals:

$XLIX$ 

Write the following Roman numerals as Hindu-Arabic numerals:

$CMLXV$ 

Write the following Roman numerals as Hindu-Arabic numerals:

$CIX$ 

Write the following Roman numerals as Hindu-Arabic numerals:

$DLXIX$ 

Write the following Roman numerals as Hindu-Arabic numerals:

$XCIV$ 

Write the following Roman numerals as Hindu-Arabic numerals:

$CLXVII$ 

Write the following Roman numerals as Hindu-Arabic numerals:

$CCCXL$ 

Write the following Roman numerals as Hindu-Arabic numerals:

$CDXLV$ 

Estimate the sum by rounding off the numbers to nearest tens:

$22+587$