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\[ - 1\]

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Let the additive inverse of given number be A

As per the rule of additive inverse,

\[ - 1 + A = 0\]

\[A = 0 + 1\]

\[A = 1\]

Therefore, we can say that the additive inverse of -1 is 1.

Do not get confused between the additive inverse and additive identity. Additive identity property states that for any number a, the sum \[a\] and \[0\] is equal to \[a\].

The additive inverse can also be called a reverse sign, opposite sign, negation, etc.

Inverses like additive inverse are useful for learning how to cancel terms when solving the variables in formulas and equations. This process is used for deleting terms in the process.