Ms. Iovino

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Multiplying and Dividing Integers

• Ms. Iovino

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To Multiply and Divide Integers,We use the same
set of rules.
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Meet the Negative Family
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The negative people live in negativeland. In
negativeland, you must follow the rules that are
listed here.
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Rules to NegativeLand

• There are only two things that you can do in
  negativeland (Shop or Math)
• You can only go shopping in negativeland, if you
  have ONE other friend to go with.
• If you dont go shopping you stay home and do
  math (meaning you are in the answer).

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Lets try a problem..4 x 2
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Multiply, like you would without the negative
sign.4 x 28How many negative signs do you see?

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One negative sign4 x 2One negative sign
represents one negativeland resident.

• Does he have anyone to shop with?

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Nope, He doesnt..So he stays home in the
answer.4 x 2 -8
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Try these problems..

• -5 x 3
• -8 x 3
• 10/-2
• -14/-2
• -20/5
• -3 x 4 x 1

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Here are the answers..

• -5 x 3 15 The two negative people go shopping.
• -8 x 3 -24 One negative sign makes a negative
  answer.
• 10/-2 -5 One negative sign, negative answer.
• -14/-2 7 Two negative signs cancel out.
• -20/5 -4 One negative sign, negative answer.
• -3 x -4 x-1 -12 Two negative signs cancel out
  and one is left in the answer.

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In conclusion, when multiplying and dividing
integers, every two negative signs cancel each
other out.
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If you have an even number of negative signs,
your answer is negative.
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• If you have an odd number of negative signs, your
  answer is positive.

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Any Questions????