It is 18
66
No. No number can have a factor larger than itself.
There is no common factor as you have to have at least 2 numbers to have a "common" factor. The greatest factor of 225 other than 225 is 75
No. No number can have a factor greater than itself.
Since 27 is a factor of 54, and 27 cannot have a larger factor than itself, the greatest common factor of 27 and 54 is 27.
Well, not always. The GCF and LCM of 10 and 10 is 10. But apart from that special circumstance, the statement is true. Apart from a number itself, all of its factors are smaller than it. Apart from a number itself, all of its multiples are larger than it. You can't have a GCF that is greater than the smaller number, and you can't have an LCM that is less than the larger one which means that the LCM of two numbers will never be less than the GCF. Factors go into numbers, numbers go into multiples.
To find the greatest factor of a number (other than itself) you first need to find the prime factors of that number. In this case, the prime factors of 100 are 2, 2, 5 and 5. The next step is to multiply all these together, except the smallest (2). This means you multiply 2x5x5. That works out at 50. Thus the greatest factor of 100 (other than itself) is 50.
Since 15 is a factor of 45, and 15's largest factor cannot be larger than itself, the greatest common factor of 15 and 45 is 15.
The GCF of 12 and 29 is 1 because 29 is a prime and has no factors other than 1 and itself.
When one of the numbers is a factor of the other, the smaller one is the GCF, because a number can't have a factor larger than itself.
They have no common factor other than 1.
The greatest common factor of two numbers is their HCF.The HCF of 53 and 86 is 1 as 53 is a prime number and does not have any factors other than 1 and itself so, the greatest common factor of 53 and 86 is 1.