The only common factor of those two numbers is 1.
The only common factor of 8 and 21 is 1.
1, 2, 4, 8 1, 3, 7, 21
8/21 cannot be simplified as there is no common factor to 8 & 21. It can be expressed as a decimal 0.3809523 (to 7 dps)
the greatest common factor of 8 21 and 75 is 1.
It is: 1
1
21=3x714=2x77 is the greatest common factor
1, 2, 4, 8
-21 has four factor pairs. (21,-1)(-21,1)(7,-3)(-7,3) None of them have a sum of -8.
Oh honey, the greatest common factor of 8 and 21 is 1. Those two numbers couldn't be more different if they tried. It's like trying to find common ground between a cat and a dog - just not gonna happen.
The GCF is 7.
The total number of integers that are multiples of both 8 and 21 is infinite. The first few are these: 168, 336, 504, 672, 840 . . .