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multiply rational numbers.
SOL: none
Objective
The student will be able to:
Designed by Skip Tyler, Varina High School and...
Multiplying Rules
1) If the numbers have the same
signs then the product is positive.
(-7) • (-4) = 28
2) If the numbers h...
Examples
1) (3x)(-8y)
−20( )
4
5



2) Write both numbers as a fraction.
Cross-cancel if possible.
−
20
1




4
5
...
−
2
5




−
5
8




3)
10
40
=
1
4
=
Multiply: (-3)(4)(-2)(-3)
1. 72
2. -72
3. 36
4. -36
Answer Now
an easy way to determine the sign of the answer
3 negative signs -> Odd -> answer is negative
-480
When you have an odd nu...
Last one!
5) −
1
2




−6( ) 5( )
−2
5




−2( )
Positive or negative answer?
Positive - even # of negative signs ...
What is the sign of the product of
(-3)(-4)(-5)(0)(-1)(-6)(-91)?
1. Positive
2. Negative
3. Zero
4. Huh?
Answer Now
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4 1 multiplying rational numbers examples

  1. 1. multiply rational numbers. SOL: none Objective The student will be able to: Designed by Skip Tyler, Varina High School and Nicole Kessinger Deep Run High School
  2. 2. Multiplying Rules 1) If the numbers have the same signs then the product is positive. (-7) • (-4) = 28 2) If the numbers have different signs then the product is negative. (-7) • 4 = -28
  3. 3. Examples 1) (3x)(-8y) −20( ) 4 5    2) Write both numbers as a fraction. Cross-cancel if possible. − 20 1     4 5     − 80 5 = -16 Multiplying fractions: top # • top # Bottom # • bottom# -24xy
  4. 4. − 2 5     − 5 8     3) 10 40 = 1 4 =
  5. 5. Multiply: (-3)(4)(-2)(-3) 1. 72 2. -72 3. 36 4. -36 Answer Now
  6. 6. an easy way to determine the sign of the answer 3 negative signs -> Odd -> answer is negative -480 When you have an odd number of negatives, the answer is negative. When you have an even number of negatives, the answer is positive. 4) (-2)(-8)(3)(-10) Do you have an even or odd number of negative signs?
  7. 7. Last one! 5) − 1 2     −6( ) 5( ) −2 5     −2( ) Positive or negative answer? Positive - even # of negative signs (4) Write all numbers as fractions and multiply. =12 − 1 2     − 6 1     5 1     −2 5     − 2 1     120 10
  8. 8. What is the sign of the product of (-3)(-4)(-5)(0)(-1)(-6)(-91)? 1. Positive 2. Negative 3. Zero 4. Huh? Answer Now
  • JacquieFreund

    Nov. 9, 2015

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