If by "LCF" you mean "lowest common factor", then that's always ' 1 ',for any pair or larger group of numbers.The greatest common factor of 15 and 45 is 15.
The factors of 12 are: 1, 2, 3, 4, 6, 12The factors of 15 are: 1, 3, 5, 15The factors of 21 are: 1, 3, 7, 21The common factors are: 1, 3The Greatest Common Factor (GCF) is: 3
The LCM of 15 and 25 is 75. The least common multiple of two numbers is the product of the two numbers divided by their greatest common factor. The greatest common factor of 15 and 25 is 5. (See related question "What is the greatest common factor of 15 and 25?" for this calculation.) So, the least common multiple is 15 x 25 ÷ 5 = 75. The least common multiple (LCM) is often also called the lowest common multiple or smallest common multiple. Keep in mind that these different terms all refer to the same thing: the smallest positive integer which is a multiple of two or more numbers.
15: 3*5 5: 1*5 so it's 5
5 and 10 10 and 15 15 and 20
the greatest common factor of 6,12, and 15 is 3.
3
The GCF is 15.
The greatest common factor of the numbers 15 and 12 is 3.
The Greatest Common Factor of 12, 15 is 3.
1
3
It is: 3
1
15
The GCF is 3.
3