multiplying integers concept 7. things you need to know… a “negative” sign and a “minus”...
TRANSCRIPT
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Multiplying Integers
Concept 7
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Things you need to know…
• A “negative” sign and a “minus” sign mean the same thing
• A “negative” sign and a “minus” sign mean
“change direction”• Always assume your moving in a positive
direction unless you are told to “change direction”
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Example: 8
A positive 8 means go forward eight
-10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10
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Example: -8
-10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10
A “negative” 8 means “change direction” andgo eight
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How to Multiply Integers
Using colored beans
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Things you need to know
• White means a positive answer• Shaded means a negative answer• To “change direction” simply flip the bean• Always assume you are moving in a
positive direction until you are told to “change direction”
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3 x 4
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3 x 4
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3 x 4
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3 x 4
12
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-3 x 4
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-3 x 4
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-3 x 4
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-3 x 4
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-3 x 4
-12
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3 x -4
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3 x -4
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3 x -4
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3 x -4
-12
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-3 x -4
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-3 x -4
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-3 x -4
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-3 x -4
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-3 x -4
-12
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-3 x -4
12
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Fast Way
An even number of negative signsin a problem means the solution is positive
An odd number of negative signs in a problem means the solution is negative
7 x -3
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Fast Way
An even number of negative signsin a problem means the solution is positive
An odd number of negative signs in a problem means the solution is negative
7 x -3
This problem has one negativeOne is an odd number Therefore, the solution is negativeNow, just multiply the numbers!
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Fast Way
An even number of negative signsin a problem means the solution is positive
An odd number of negative signs in a problem means the solution is negative
7 x -3
This problem has one negativeOne is an odd number Therefore, the solution is negativeNow, just multiply the numbers!
-21
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Fast Way
An even number of negative signsin a problem means the solution is positive
An odd number of negative signs in a problem means the solution is negative
-4 x -5
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Fast Way
An even number of negative signsin a problem means the solution is positive
An odd number of negative signs in a problem means the solution is negative
-4 x -5
This problem has two negativesTwo is an even number Therefore, the solution is positiveNow, just multiply the numbers!
![Page 31: Multiplying Integers Concept 7. Things you need to know… A “negative” sign and a “minus” sign mean the same thing A “negative” sign and a “minus” sign](https://reader035.vdocument.in/reader035/viewer/2022062315/56649ec85503460f94bd5c10/html5/thumbnails/31.jpg)
Fast Way
An even number of negative signsin a problem means the solution is positive
An odd number of negative signs in a problem means the solution is negative
-4 x -5
This problem has two negativesTwo is an even number Therefore, the solution is positiveNow, just multiply the numbers!
20
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Fast Way
An even number of negative signsin a problem means the solution is positive
An odd number of negative signs in a problem means the solution is negative
-2 x -3 x -1
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Fast Way
An even number of negative signsin a problem means the solution is positive
An odd number of negative signs in a problem means the solution is negative
-2 x -3 x -1
This problem has three negativesThree is an odd number Therefore, the solution is negativeNow, just multiply the numbers!
![Page 34: Multiplying Integers Concept 7. Things you need to know… A “negative” sign and a “minus” sign mean the same thing A “negative” sign and a “minus” sign](https://reader035.vdocument.in/reader035/viewer/2022062315/56649ec85503460f94bd5c10/html5/thumbnails/34.jpg)
Fast Way
An even number of negative signsin a problem means the solution is positive
An odd number of negative signs in a problem means the solution is negative
-2 x -3 x -1
This problem has three negativesThree is an odd number Therefore, the solution is negativeNow, just multiply the numbers!
-6