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If those are the denominators, then the the negative part of -15 should be transferred to the numerator, eg if the fraction is 4/(-15) then make it (-4)/15, or if it is (-4)/(-15) make it (--4)/15 = 4/15.
Then the lcm of 15 and 10 is 30.
(Otherwise you are likely to have trouble in getting your signs right if you use a negative denominator.)
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What is the least common denominator of 6 10 and 15?
Answer: 30 If those numbers are denominators, the least common denominator is the least common multiple of the three. In this case, 30 is the LCM of 6, 10 and 15, so 30 is the least common denominator.
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least common denominator for 15 and 10 is 30, so 9/15 = 18/30 and 7/10 = 21/30
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What is common denominator for 15 and 8?
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What is the greatest common denominator of 9 and 15?
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