The lcm or lcd is 5751
common denominator of eight and nine
8100
Since 8 is 23 and 81 is 34, the least common denominator is 23 x 34 = 648.
the number 9
4536
common denominator of eight and nine
Least Common Multiple (LCM) for 71 81 is 5,751
71 and 81 are coprime so the only common factor is 1.
8100
Their product.
3
Since 8 is 23 and 81 is 34, the least common denominator is 23 x 34 = 648.
the number 9
4536
It is: 324
LCD(9, 16, 18, 81) = 1296
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.