Those are the "factors" of 80. They are: 1, 2, 4, 5, 8, 10, 16, 20, 40, and 80.
The highest common factor is the greatest number which both numbers can divide by evenly. In this case, the greatest number 40 can divide by is 40. 80 can also divide by 40, and so this is a common factor. As no numbers greater than 40 will be able to divide 40 evenly, the hcf of 40 and 80 is 40.
These numbers divide into 15 evenly: 1 3 5 and 15.
1, 2, 4, 5, 10, and 20 divide evenly into 20.
5 & 17
1 and 13
The highest common factor is the greatest number which both numbers can divide by evenly. In this case, the greatest number 40 can divide by is 40. 80 can also divide by 40, and so this is a common factor. As no numbers greater than 40 will be able to divide 40 evenly, the hcf of 40 and 80 is 40.
A factor can divide into its multiple evenly.
2 and 60 will divide evenly into 120.
These numbers divide into 15 evenly: 1 3 5 and 15.
The GCF of all those is the largest number that divides evenly into all of them. Here, the GCF is 2 because no other numbers evenly divide into all of the above numbers.
These are the numbers that divide into 28 evenly: 1, 2, 4, 7, 14, 28.
1, 2, 4, 5, 10, and 20 divide evenly into 20.
Ten of them.
divisors
They are called factors or divisors.
The greatest common factor of these numbers is 1. If it were a composite number, we could say that that number, and all the numbers that divide it evenly, divide these numbers evenly. However, these numbers are relatively prime-that is, the only factor they share is 1.
Any of its factors