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The number system now in commonest use worldwide is positional. Consider a number such as 924.37. The position of each digit in the number indicates how significant it is. The digit 9 represents 100s, the 2 10s, the 4 1s, and so on.The Roman number, or 'numeral' system, is non-positional. The value of a character in a number does not depend on its position only. Rather, the value of a character depends on what the character is and on neighbouring characters. Consider a number such as XLIV. In this case the 'X' means ten but only as a modifier for the 'L' which stands for fifty, so that the combination 'XL' means 40.
hieratic numerals did not form a positional system so the particular numerals could be written in any order.
The number system that we use today is the Hindu-Arabic numeral system and a 0 number is essential for positional place value purposes as for example it shows us that there is a difference between 27 and 207 but a 0 number is not needed in the Roman numeral system because the positional place value of its numerals are self evident as for example XXVII is 27 and CCVII is 207
Their are two types of number systems. 1. Non positional number systems 2. Positional number systems.
So as not to be shortchanged when handling money because there's a difference between $203 and $2003 and knowing the positional place value of numbers by means of the 0 symbol will prevent any mistakes.