Since 8 is 23 and 81 is 34, the least common denominator is 23 x 34 = 648.
LCD(9, 16, 18, 81) = 1296
common denominator of eight and nine
8100
The least common denominator of 8 and 9 is found by finding the multiples of each number so: Multiples of 8 = 8, 16, 24, 32, 40, 48, 56, 64, 72, 80 Multiples of 9 = 9, 18, 27, 36, 45, 54, 63, 72, 81, 90 Now look at your results and find the smallest number that is the same. 72 is the lowest, so that's is the least common denominator of 8 and 9
Since 8 is 23 and 81 is 34, the least common denominator is 23 x 34 = 648.
LCD(9, 16, 18, 81) = 1296
The least common multiple of 58 and 81 is 4698. To find the least common multiple of big numbers, take 1/(number 1)+1/(number 2), then find a common denominator, then add them together and reduce. The denominator of this reduced fraction is the least common multiple. In this example, 1/58+1/81=81/4698+58/4698=139/4698, which does not reduce so 4698 is the least common multiple.
The common factor of 56 and 81 is 1.
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.
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.
The greatest common factor of 56 and 81 is 1.
common denominator of eight and nine
The greatest common factor for 56 and 81 is 1. There are no common factors between 81 and 56 aside from 1. This means that the GCF is 1.
Assuming that least common refers to the least common multiple, LCM(27, 81) = 81
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Their product.