The LCM applies to whole numbers, not fractions. If you're trying to find the least common denominator, it's 12.
The LCD for the given three numbers is 60
As stated, this question does not appear to be particularly useful. The lowest common factor of the numbers is 1. The lowest common MULTIPLE of the three numbers, which could be of use, is 30.
3 * 7
The LCM of the given three numbers is 120
210
8
The lowest common denominator would be twelve!
1/2 , 3/4 , 7/8. The denominators are 2, 4, and 8. The lowest common multiple of these numbers is 8. This becomes the lowest common denominator.
Since five, two, and three are all prime, the lowest common denominator is 30 or 2 * 3 * 5.
12
The lowest common denominator of 6 and 9 is three.
20
I'm assuming your talking about the Lowest Common Denominator (LCD) of: 1/3, 1/6, 1/7, and 1/14. You can find the LCD by finding the Least Common Multiple (LCM) of the denominators (3,6,7,14). Idk set way to do that, but its 42
15
1/7 + 3/8 = 8/56 + 21/56 is the lowest common denominator.
6 the lowest common denominator is the least common multiple of the denominators after both fractions have been simplified as far as possible. 3/6 can be simplified as 1/2. 2/3 cannot be simplified any further. The LCM of 3 and 2 is 6, so the lowest common denominator is 6.