$287=\underset{\text{CC}}{\underbrace{200}}+\underset{\text{LXXX}}{\underbrace{80}}+\underset{\text{VII}}{\underbrace{7}}=\text{CCLXXXVII}$  

 

  $212=\underset{\text{CC}}{\underbrace{200}}+\underset{\text{X}}{\underbrace{10}}+\underset{\text{II}}{\underbrace{2}}=\text{CCXII}$  

 

$1642=\underset{\text{M}}{\underbrace{1000}}+\underset{\text{DC}}{\underbrace{600}}+\underset{\text{XL}}{\underbrace{40}}+\underset{\text{II}}{\underbrace{2}}=\text{MDCXLII}$  

 

$1727=\underset{\text{M}}{\underbrace{1000}}+\underset{\text{DCC}}{\underbrace{600}}+\underset{\text{XX}}{\underbrace{20}}+\underset{\text{VII}}{\underbrace{7}}=\text{MDCCXXVII}$  

 

$1596=\underset{\text{M}}{\underbrace{1000}}+\underset{\text{D}}{\underbrace{500}}+\underset{\text{XC}}{\underbrace{90}}+\underset{\text{VI}}{\underbrace{6}}=\text{MDXCVI}$  

 

$1650=\underset{\text{M}}{\underbrace{1000}}+\underset{\text{DC}}{\underbrace{600}}+\underset{\text{L}}{\underbrace{50}}=\text{MDCL}$