There are three important properties of number used in measurement-
• Identity: The number or symbols that are used in mathematics are unique of each number.
• Rank order: Numbers, except for cases of equality, can be places in an incontrovertible order along a linear scale.
• Additivity: By additicity is meant the fact that the operation of addition gives results that are internally consistent.
Special cases of addition are-
Subtraction= addition of negative numbers.
Multiplication=Successive addition of same number
Division= successive subtraction
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