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Multiplication of Signed Numbers

Your turn:

-3 x 2 =

-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