anonymous
  • anonymous
-1/12 - 3/4 = A. -1/3 B. -5/6 C. 2/3 D. -4/16
Mathematics
chestercat
  • chestercat
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phi
  • phi
can you find the common denominator?
anonymous
  • anonymous
4
phi
  • phi
for 12 list out its multiples: 12,24,36 for 4: 4,8,12,16,20 look for a number on both lists

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phi
  • phi
This might help you http://www.khanacademy.org/math/arithmetic/fractions/v/adding-fractions-with-unlike-denominators
anonymous
  • anonymous
As phi said, both 4 and 12 have a common multiple of 12. 4 multiplied by 3 equals 12, so multiply the numerator(3) by 3 as well. \[\frac{ -1 }{ 12 } *1 = \frac{ -1 }{ 12 }\]\[\frac{ 3 }{ 4 } *3 = \frac{ 9 }{ 12 }\] Now find the difference of the numerators: \[\frac{ -1 }{ 12 } - \frac{ 9 }{ 12 } = \frac{ (-1) - 9 }{ 12}\]

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