Friday, September 11, 2009

For periods B, F, and G - tips on multiplying and dividing integers.

Rules:

Multiplying same signs :
1. Multiply.
2. The answer is always positive.

Multiplying different signs:
1. Multiply.
2. The answer is always negative.


Dividing same signs:
1. Divide.
2. The answer is always positive.

Dividing different signs:
1. Divide.
2. The answer is always negative.

Ex. -3 x 9
First you multiply 3 x 9 to get 27, then since you are multiplying different signs the answer is negative, so the answer is -27.

Ex. -9 / -3
First you divide 9 by 3 to obtain 3, then since both signs are the same the answer is positive, so the answer is 3.

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