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phi Group TitleBest ResponseYou've already chosen the best response.1
can you find the common denominator?
 one year ago

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

phi Group TitleBest ResponseYou've already chosen the best response.1
This might help you http://www.khanacademy.org/math/arithmetic/fractions/v/addingfractionswithunlikedenominators
 one year ago

jazy Group TitleBest ResponseYou've already chosen the best response.0
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: \[\frac{ 1 }{ 12 }  \frac{ 9 }{ 12 } = \frac{ (1)  9 }{ 12}\]
 one year ago
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