1Cademy - What is the additive inverse of $$-85$$? What is the sum of $$-85$$ and its additive inverse?

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Additive Inverse

Case Study

What is the additive inverse of $-85$ ? What is the sum of $-85$ and its additive inverse?

Case context: You are working with the number $-85$ and its additive inverse.

Question: What is the additive inverse of $-85$ ? What is the sum of $-85$ and its additive inverse?

Sample answer: The additive inverse of $-85$ is $85$ . Adding them gives $-85 + 85 = 0$ .

Key points:

The additive inverse of $a$ is $-a$ .
The additive inverse of $-85$ is $85$ .
A number plus its additive inverse equals $0$ .
$-85 + 85 = 0$

Rubric: Full credit: states the additive inverse is $85$ and the sum is $0$ . Partial credit: gives only one correct part. No credit: neither part correct.

Updated 2026-09-17

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