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# Additive inverses

If two numbers added together equal zero, they are called **additive inverses**. For example, (9) + (-9):

- The additive inverse of 9 is -9
- The additive inverse of -9 is 9 (or +9)

# Simplifying the adding of mixed integers

The rules are:

- Positive & positive = positive

For example, - Negative & negative = positive

For example, - Negative & positive = negative

For example, - Positive & negative = negative

For example,

# Adding integers

**Adding integers** is where a set of numbers are added together.

For example, (or +11)

Another example,

Another example,

Another example, (or +2)

# Subtracting integers

**Subtracting integers** is where numbers are taken away from other numbers.

For example,

Another example,

The key with subtracting something in brackets, is to convert the minus into a plus, and then inverting the content in the brackets. For example, instead of . to have

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