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The additive inverse of a number is the opposite of that number, that is, the additive inverse of a number x is -x. The sum of a number and its additive inverse is always zero, that is, x + (-x) = 0. Related Terms: addition, number, opposites, sum, zero. English | Espaol.
Addition or subtraction of two whole numbers with whole number answers, and with sum or minuend in the range 0-5, 0-10, 0-20, or 0-100, respectively. Example: 8 + 2 = 10 is an addition within 10, 14 â 5 = 9 is a subtraction within 20, and 55 â 18 = 37 is a subtraction within 100. Additive inverses. Two numbers whose sum is 0 are additive inverses of one another. Example: 3/4 and â 3/4 are additive inverses of one another because 3/4 + (- 3/4) = (- 3/4) + 3/4 = 0. Associative property of addition. See Table 3 in this Glossary.