1,2, and 4
20: 1,2,4,5,10,2050: 1,2,5,10,25,50Common Factors: 1,2,5,10
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 .
5
Since 20 is a factor of 40, all of its factors are common.
To find the common factors of 30 and 20, we first list the factors of each number. The factors of 30 are 1, 2, 3, 5, 6, 10, 15, and 30. The factors of 20 are 1, 2, 4, 5, 10, and 20. The factors that are common to both numbers are 1, 2, 5, and 10.
Because there are only six factors... 1,2,4,5,10 & 20
The common factors of 22 and 20 are: 1 and 2.
The answer to the question is: "All of the common factors of 10, 25, and 20 are 1 and 5 ."
The common factors are: 1, 2, 4
(1,20),2,10,4,5
Common factors of 18 and 20 are: 1 and 2.