There is none because the Least Common Denominator (or LCD) refers to the Least Common Multiple (LCM) of the denominators of two or more fractions or mixed numbers. Even if you converted your whole numbers (x) to their fraction equivalents (x/1), the LCD would always be 1.
The lowest common denominator of 12 and 256 is 1.
The Least Common Multiple (LCM) for 108 256 is 6,912.
The least common multiple for 196, 225 and 256 is 2,822,400
64 + 192 = 256
75% of 256= 75% * 256= 0.75 * 256= 192
192
768
109,312
11008
The sum of 64 and 192 is 256.
256
The GCF of192 and 256 is 64. This gives you 3 and 4 respectively. You cannot get any more common factors that impact the end figure.