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anonymous

  • 5 years ago

2/3, 3/7, 7/8 common denominator?

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  1. sandra
    • 5 years ago
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    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

  2. anonymous
    • 5 years ago
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    correct

  3. sandra
    • 5 years ago
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    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

  4. anonymous
    • 5 years ago
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    so 168 is the common denominator.

  5. sandra
    • 5 years ago
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    yes, that is one common denominator for sure

  6. sandra
    • 5 years ago
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    since 168 is divisible by 3, 7, and 8 - and you know this is true since you multipled them all together

  7. anonymous
    • 5 years ago
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    is that the lowest common denominator?

  8. sandra
    • 5 years ago
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    yes, I belive so: http://en.wikipedia.org/wiki/Least_common_multiple#Calculating_the_least_common_multiple

  9. sandra
    • 5 years ago
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    see the prime factorizatoin method part of that article

  10. anonymous
    • 5 years ago
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    Thanks

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