absolute value The absolute value of a number is the distance between the number and 0 on the number line. The absolute value of a number is the larger of the number and its opposite. The absolute value of a positive number is the number itself, and the absolute value of a negative number is the opposite of the number. The absolute vaIue of 0 is 0. The notation for the absolute value of n is I n I. abundant number A number for which the sum of all the proper factors is greater than the number itself. For example, 12 is an abundant number because the sum of its proper factors i
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