Place Value Notation

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In the original Roman Numeral representation of a number
a symbol always represents the same value regardless of it position.
In the following examples X always represents 10.
  CLX = (100+50+10)     LXV = (50+10+5)     XVI = (10+5+1)

The decimal system that we use is a Place Value (or Positional) System.
The place value of a symbol depends on two things multiplied together:
• the value of the symbol itself
• the weighting depending on the position of the symbol in the number

Example  7329

9 in the	Units column has a place value of	9 x 1 =	9
2 in the	Tens column has a place value of	2 x 10 =	20
3 in the	Hundreds column has a place value of	3 x 100 =	300
7 in the	Thousands column has a place value of	7 x 1000 =	7000