Write the following Hindu-Arabic numerals in Roman Numerals:

$489$

Write the following Hindu-Arabic numerals in Roman Numerals:

$786$

Write the following Hindu-Arabic numerals in Roman Numerals:

$627$

Write the following Hindu-Arabic numerals in Roman Numerals:

$577$

$\mathrm{IV}+\mathrm{X}=$_____

Fill in the blanks:

$\mathrm{L} ÷$_____$= \mathrm{X}$

$\mathrm{C}-\mathrm{IX}+\mathrm{VII} =$ _____

Fill in the blanks:

$\mathrm{CDXXI}=$_____

$\mathrm{MCMXC}=$_____