**Do you ever feel like you can’t even
get started?** Algebra is great, but if you want to learn it, you
have to have a good understanding of number rules. Suppose you’re rolling
along and realize that you forgot how to multiply integers, add fractions,
or divide a decimal? Well, you’ve come to the right place! Here we’re
going to cover all the pre-Algebra you
need—*fast*.

If you hear the weatherman say it’s “minus five,” you know that it’s **really** cold, colder than zero. Numbers sometimes need to indicate
that they are less than 0, and they do that by adding a negative (or minus sign) in front of
the number.

So, that’s a negative number. What are the other numbers, the
plain ones? Those are positive numbers. They are indicated by no sign or a positive sign. If you’re
working with whole positive and negative numbers, it means that you’re
working with **integers**.

**Integers -** The whole numbers,
including all of the negative numbers, zero, and positive
numbers.

{...,–3, –2, –1, 0, 1, 2, 3...}

Operations with negative numbers are similar to operations with positive numbers; ...

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