6 and any multiple greater than 1 of 6, eg 6 and 12, 6 and 18, 6 and 24, etc...
Any two multiples of 6 where the other factors are relatively prime (ie have a gcf of 1), eg 6 and 7 are relatively prime, so 6 x 6 = 36 and 6 x 7 = 42 have a gcf of 6, 2 and 9 are relatively prime, so 2 x 6 and 9 x 6 (12 and 54) have a gcf of 6, etc.
2 and 3
Always equal to or less than the smaller number, yes.
When they have a factor in common greater than one.
Lots of numbers are NOT common factors. For example, 5, 7, 100...Get the greatest common factor of both numbers. All common factors are factors of this greatest common factor. Note that all of them must needs be less than or equal to the greatest common factor. Any other number is NOT a common factor.
The product of the GCF and LCM is equal to the product of the original two numbers.
No.
Yes, if one of the numbers is a factor of the other.
2 and 3
If one number is divisible by another (in this case, 15 is divisible by 5), then the least common multiple is equal to the larger of the numbers (15), and the greatest common factor is equal to the smaller of the numbers (5).If one number is divisible by another (in this case, 15 is divisible by 5), then the least common multiple is equal to the larger of the numbers (15), and the greatest common factor is equal to the smaller of the numbers (5).If one number is divisible by another (in this case, 15 is divisible by 5), then the least common multiple is equal to the larger of the numbers (15), and the greatest common factor is equal to the smaller of the numbers (5).If one number is divisible by another (in this case, 15 is divisible by 5), then the least common multiple is equal to the larger of the numbers (15), and the greatest common factor is equal to the smaller of the numbers (5).
Yes, if that number is a factor of the other.
Yes.
A single number cannot have a greatest common factor because "common" refers to factors that two or more numbers have in common. You have only one number.
Yes, if you're comparing a number to itself.
The least common factor of any set of numbers is 1.
Only if the magnitudes of two numbers are the same.
Yes as for example 34 and 45
Always equal to or less than the smaller number, yes.