There can be no greatest common denominator. If you have a set a numbers whose least common denominator is L then 2*L, 3*L, … are all common denominators. There is no end to that sequence and so no greatest.
Since 54 is a multiple of 18, it will also be the least common denominator of the two.
The greatest common factor of 36, 81 and 18 is 9
The GCF is 9.63/81 = 7/9
Assuming that least common refers to the least common multiple, LCM(27, 81) = 81
No, 18 is not a factor of 81.
You need at least two numbers to find something in common between them.
LCD(9, 16, 18, 81) = 1296
common denominator of eight and nine
3
Their product.
8100
Since 8 is 23 and 81 is 34, the least common denominator is 23 x 34 = 648.
the number 9
4536
It is: 324
The lcm or lcd is 5751
The LCM of 18 and 81 is 162
Convert both to decimal, and compare. For example, divide 81 / 105, and write down the decimal equivalent; the same for the other fraction. OR: Find a common denominator, and convert both to the common denominator. It need not be the least common denominator; any common denominator will do - for example, if you multiply 105 x 300, you have a common denominator (which is not the least common denominator in this case). The decimal method is much easier, by the way.