No, 5 is not a factor of 109. All numbers that have 5 as a factor end with 5 or 0.
Yes, 5 is a factor of all whole numbers ending in 5.
Not AllTo find out if all numbers that have 5 as a factor have 2 as a factor, you can list the multiples of each. 5's multiples are 5, 10, 15, 20...2's multiples are 2, 4, 6, 8, 10, 12, 14, 16, 18, 20...5 and 15 are multiples of 5, but not 2, so all numbers that have 5 as a factor DO NOT have 2 as a factor.It is not really necessary to write that all out because the fact that 5 is an odd number and 2 is only a factor of even numbers indicates that all numbers that have 5 as a factor would not have 2 as a factor. Only the multiples of 5 that are even have 2 as a factor also.
No.
Since 5 is a factor of 20, all the factors of 5 are common to 20.
5 is the only prime number in which 5 is a factor.
Any number that has another number for a factor has that number's factors as factors as well. Since 5 is a factor of 10, all multiples of 10 have 5 as a factor.
(1, 25) (5, 5)
Since 5 is a factor of 10, all of its factors are common.
1 x 5, 5 x 1
Yes.
1,2,3,4,5,6,7,8,9 and so on.