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the answer is 45. You compute it by reducing each number to its prime factors, and taking the unique set. 9 factors to 3x3, 15 to 3x5, so the unique set is one 3 from the 9, one 3 that they share and one 5 from the 15. 3x3x5=45. Of course, 135 is also a common denominator but isn't the least. you can always find a CD by multiplying the two. The LCD will make simplification after the addition or subtraction of fractions much easier.
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Related questions
What is the LCD for 9 and 15?
LCD(9, 15) = 45
What is the LCD of 15 9 and 8?
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What is the LCD 9 15 5 10?
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What is the LCD of 9 over 15 and 8 over 17?
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What is the least common multiple of 4 9 and 15?
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What is the LCD for 3 and 9?
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LCD(15, 26) = 390
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What is the lcd for 9 and 36?
LCD(9, 36) = 36.
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