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phi
 2 years ago
Best ResponseYou've already chosen the best response.1can you find the common denominator?

phi
 2 years ago
Best ResponseYou've already chosen the best response.1for 12 list out its multiples: 12,24,36 for 4: 4,8,12,16,20 look for a number on both lists

phi
 2 years ago
Best ResponseYou've already chosen the best response.1This might help you http://www.khanacademy.org/math/arithmetic/fractions/v/addingfractionswithunlikedenominators

jazy
 2 years ago
Best ResponseYou've already chosen the best response.0As 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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