first lets start where lcd's where invented: they where invented by Hans lcd who was king of timbuktoo and gave them to the rest of the world by military force
LCD(39, 78) = 78
It is 3/7 of 91 = 39
GCF(39, 654, 91) = 1.
It is: 39
It is: 1833
The common factors of 39 and 91 are: 1 and 13
39/91 = 3/7
LCD(65, 91) = 455
LCD(49, 21) = 147
It is: 39/91 = 3/7
13 is a prime number and 39 is a multiple of 13. 39 is the LCD of 13 and 39.
The GCF is 13.