Opposite number facts for kids
In mathematics, opposite number or additive inverse of any number is a number n which, if added to n, results in 0 (the identity element of addition). The opposite number for n is written as −n. For example, −7 is the opposite number of 7, because 
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For positive numbers, the opposite number is simply the negative version of the number. For negative numbers, the opposite number is the positive version of the number.
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In Spanish: Opuesto para niños
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Opposite number Facts for Kids. Kiddle Encyclopedia.