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Video: Finding the Additive Inverse of a Number

Kathryn Kingham

What is the additive inverse of −299?

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Video Transcript

What is the additive inverse of negative 299?

The additive inverse is what you add to a number to get zero. Here’s one way we can look at that. We’re starting with negative 299. So we’ll place that on our number line. The additive inverse is the number that’s going to help us move from negative 299 to zero on a number line.

There are 299 spaces between negative 299 and zero on a number line. And because we’re moving to the right on our number line, this means we’ll be working with a positive number. Negative 299 plus 299 equals zero. This means 299 is the additive inverse of negative 299.