WARMUP

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WARMUP

• 1. (3) - (-5) ___
• 2. (-3) - (-7) ____
• 3. (- 3) - (- 4) 12 ___

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HOMEWORKDO HANDOUT 152 DO ALL

• IF YOU CAN DO THESE YOU ARE A SUPER MATHEMATICIAN

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MULTIPLYING DIVIDING INTEGERS
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Multiplying Dividing Integers
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Multiplying and Dividing Integers is actually
very easy!
The rules are the same for both multiplication
and division.
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By the way, when you MULTIPLY two numbers, the
result is called the ___________.
product
When you DIVIDE two numbers, the result is called
the ___________.
quotient
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If both numbers you are multiplying or dividing
have the same sign, your answer will be positive!
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Both Numbers Negative
Even if both numbers are NEGATIVE, The answer is
ALWAYS...
POSITIVE!
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Try a few!
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One Number Negative One Number Positive
The answer when one number is positive and the
other negative is ALWAYS...
NEGATIVE!
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Does it matter which number is larger?
NO!
Does it matter whether the negative number comes
first or last?
NO!
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Try a few!
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Of course, you may have to multiply more than two
numbers together.
For example
If you multiply them two-at-a-time, you should
have no problem...
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So when you multiply 4 negative numbers the
product is
POSITIVE!
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If you had multiplied 3 negative numbers the
product would be
NEGATIVE!
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When you multiply an EVEN number of negative
numbers together, the answer will be...
POSITIVE!
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When you multiply an ODD number of negative
numbers together, the answer will be...
NEGATIVE!
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Does it matter how many POSITIVE numbers are
involved?
NO!
So, without doing the actual multiplication,
would the following products be positive? Or
negative?
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NEGATIVE!
POSITIVE!
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Multiplying Two Numbers With Like Signs () ?
() () () ? () ()
Multiplying Two Numbers With Unlike Signs () ?
() () () ? () ()
Dividing Two Numbers With Like Signs () ()
() () () ()
Dividing Two Numbers With Unlike Signs () ()
() () () ()
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Multiplying Dividing Integers
You Got It!!!
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INTEGER RULES
RULE 1 ADDING, SAME SIGNS - ADD NUMBERS -
KEEP SIGNS
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INTEGER RULES
RULE 2 ADDING, DIFFERENT SIGNS - SUBTRACT
NUMBERS - KEEP SIGN OF HIGHEST
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INTEGER RULES
RULE 3 SUBTRACTING - CHANGE TO - CHANGE
SIGN OF 2ND NUMBER - USE RULE 1 OR 2
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INTEGER RULES
RULE 4 MULTIPLYING OR DIVIDING - SAME SIGN
ANSWER IS - DIFFERENT SIGN ANSWER IS -
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HOMEWORKDO HANDOUT 153DO ALL

• IF YOU CAN DO THESE YOU ARE A SUPER MATHEMATICIAN