Inverse Property of Addition
Inverse Property of Addition
Use the Inverse Properties of Addition and Multiplication
What number added to 5 gives the additive identity, 0?  
We know 

What number added to −6 gives the additive identity, 0?  
We know 
Notice that in each case, the missing number was the opposite of the number.
We call the additive inverse of . The opposite of a number is its additive inverse. A number and its opposite add to , which is the additive identity.
Source: Rice University, https://openstax.org/books/prealgebra/pages/74propertiesofidentityinversesandzero
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