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Multiplying and Dividing Integers
Steps: Multiply or divide the regular way Figure out the sign of the answer Rule: When multiplying or dividing two integers
with the same sign the answer is always
positive. (+)(+)=(+) (-)(-)=(+)
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1.) (4)(3) = 2.) -6 X (-7) = 3.) (-2) = 4.) -12 X (-5)= 5.) (-12) = 6.) (-9)
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When multiplying or dividing two integers
with different signs the answer is always
negative
7.) -11(4) = 8.) 8 X (-6) = 9.) -9 X 7 = 10.) 6 X (-7) = 11.) (-8) = 12.)
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Trick: 13.) (-9)(3) = ) -8 X (-7) = 15.) -9(7) = ) = 17.) (-8) = ) (-7)
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19. ) Suppose the temperature outside is dropping 3 degrees each hour
19.) Suppose the temperature outside is dropping 3 degrees
each hour. How much will the temperature change in 8 hours? 20.) The temperature outside dropped a total of 35 degrees over the past seven days. Find the average change in temperature each day.
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When multiplying more than two integers
count the number of negative integers.
-if the number of negative integers is
even the answer is positive -if the number of negative integers is odd
the product is negative 19.) (-2)(2)(-2)= 20.) (-1)(-3)(-2)
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3.) 81 (-9) = 4.) (-1)(-4)(2)= 5.) -3 X 14 = 6.) -12 X (-8)=
Demonstrate Understanding: 1.) (-7) = 2.) (-6)= 3.) (-9) = 4.) (-1)(-4)(2)= 5.) -3 X 14 = 6.) -12 X (-8)= 7.) (-11) = 8.) = 9.) (-1)(-2)(-3)(4)= 10.)36 (-6) 2=
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Solve each word problem
Solve each word problem. Be sure to write a math problem and solve your answer. 11.) Mrs. Johnson lost on an investment at a rate of $4 per day. Describe the change in her investment after 7 days. 12.) During a 5-day workweek, the stock market decreased by 65 points. Find the average daily change in the market for the week.
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