5
It's not, because all the factors of 20 aren't prime.
40 has 8 factors: 1 2 4 5 8 10 20 40.
The factors of 200 are: 1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100 and 200.
(20,1)(10,2)(5,4) (30,1)(15,2)(10,3)(6,5) (36,1)(18,2)(12,3)(9,4)(6,6)
The powers of 2 from 20 to 25.
20: 1,2,4,5,10,2050: 1,2,5,10,25,50Common Factors: 1,2,5,10
Because there are only six factors... 1,2,4,5,10 & 20
(1,20),2,10,4,5
1,2, and 4
The common factors are: 1, 2, 5, 10.
1). List all of the factors of 16. 2). List all of the factors of 20. 3). List all of the factors of 28. 4). Make a short list, comprised of any numbers that are on all three lists. These are the common factors of 16, 20, and 28. 5). Find the greatest number on the short list. That's the greatest common factor of 16, 20, and 28. If it is not 4, then an error has crept into your work, and you are doomed to return to Step-1 and eternally repeat the process until you get 4 .
The factors of 40 are 1, 2, 4, 5, 8, 10, 20, and 40
The factors of 40 are 1, 2, 4, 5, 8, 10, 20, and 40 1,2,7,14
The factors of 100 are: 1, 2, 4, 5, 10, 20, 25, 50, 10.
5
List all the factors of each number. Which factors are prime factors between 20 and 28.