Well, isn't that a happy little question! The least common denominator of 15 and 16 is 240. We can find this by multiplying the two numbers together, as 15 multiplied by 16 equals 240. Remember, there are no mistakes in math, just happy little accidents!
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LCD(3, 16) = 48
32 is the LCD of 8, 16, and 32
The least common denominator of 4,16, and 8 is 16 since 4,16, and 8 are all factors of 16. The least common denominator is an obejct known as the least common multiple (LCM) of the denominators. The reason you might want to know this is because there are standard techniques to find the LCM and also many calculator and web programs will compute it for you.
To find the least common denominator, list the multiples of each denominator. The lowest one they have in common is the LCD.For example:2/3 and 3/4:The multiples of 3 are: 3, 6, 9, 12, 15, 18, 24...The multiples of 4 are: 4, 8, 12, 16, 20, 24...The common multiples are 12 and 24. Since 12 is the least, it is the LCM.