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Party in Math-land(an integer story)
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Have you ever been to a party like this?
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Everyone is happy and having a good time.They are all Positive!
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Suddenly, who should appear?
The Grouch! (one negative)
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The grouch goes around complaining to everyone about the food, the music, the room temperature, the other people…
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What happens to the party?Everyone feels less happy!Everyone becomes negative!
My party is ruined!
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But wait! Another guest is arriving…
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The new guest is another grouch. The two negative people get together…
They start complaining to each other about how miserable they are…
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And look! They are starting to smile and have a good time…
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Pairs of negatives become positive!
The party is saved!
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Now that the two grouches are together the rest of the people (who were really positive all along) become happy once again.
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The moral of the story…
When multiplying and dividing integers, one negative make all positives negative, but two negatives become positive!
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Now, let’s practice!
Therefore, the following rules apply:
+ · + = +
+ · - = -
- · + = -
- · - = +