anonymous
  • anonymous
2/3, 3/7, 7/8 common denominator?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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sandra
  • sandra
ok, so a common denominator means "what number can I multiply all the bottom numbers by *something* to get the same number" - i.e. what are they common multiples of
anonymous
  • anonymous
correct
sandra
  • sandra
so one sure way to get a common denominator - a number all of the bottom numbers are divisors of - is to multiply them all together

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anonymous
  • anonymous
so 168 is the common denominator.
sandra
  • sandra
yes, that is one common denominator for sure
sandra
  • sandra
since 168 is divisible by 3, 7, and 8 - and you know this is true since you multipled them all together
anonymous
  • anonymous
is that the lowest common denominator?
sandra
  • sandra
yes, I belive so: http://en.wikipedia.org/wiki/Least_common_multiple#Calculating_the_least_common_multiple
sandra
  • sandra
see the prime factorizatoin method part of that article
anonymous
  • anonymous
Thanks

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