Respuesta :

Okay, I think you mean GCF, (Greatest Common Factor). :P Factors are the numbers multiplied by each other to get a number.
Example: Factors of 6: 1, 2, 3, 6.      1 times 6 = 6, and 2 times 3 = 6.
So, now you must find the GREATEST COMMON FACTOR IN VALUE between 40 and 50.
Factors of 40: 1, 2, 4, 5, 8, 10, 20, and 40.
Factors of 50: 1, 2, 5, 10, 25, and 50. 
Which is the factor that BOTH 40 and 50 have?
Well, they have a lot of the same factors, but we need to find the GREATEST ONE in value. (By value, I mean the biggest number).
So it's clear that the factor 10 is the greatest common factor, soooooo.....
Final Answer: GCM = 10. :-) 
Dansko
First, you have to figure out the factors of both of the numbers.

40: 1,2,4,5,8,10,20
50: 1,2,5,10,25,50

Second, you find the highest number they have in common which is 10.

Finally, Your Ans(10 will be your GCF)

Have a Brainly Day!