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The value of a digit depends on its position as well as its face value.
Right each number and standard form four and sixty-eight thousand
Each place has a value 10 times the value of the place to its right.
In non-positional number system, each symbol represents the same value regardless of its position.In positional number system ,each symbol represents different value depending on the position they occupy in a number.In non positional number system,its very difficult to perform arithmetic with such a number system.In positional number systems were developed.
it is the distance from 0 on a number line. the absolute value of something is never negative