Cool math Pre-Algebra Help Lessons: Signed Numbers (Integers) - Multiplication

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Your turn:

-10 x 4 =

Rule #1:

A positive times a negative
is a negative!

- x + = -

+ x - = -

(The order doesn't matter!)

Now that we see what's going on here, we can just crunch through these critters:

1)	Multiply the numbers your usual way
2)	Deal with the signs

Here are a couple of examples:

9 x -5 = -45

-7 x 6 = -42

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Signed Numbers (Integers)