1 or 3 or 9
2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71 that's as far up as it goes because 72 is a composite number not a prime number!
1 is the only common factor of 11 and 21.
1. The two numbers are coprime.
The GCF of 21 and 72 is 3Definition: A factor is a divisor - a number that will evenly divide into another number. The greatest common factor of two or more numbers is the largest factor that the numbers have in common.Method:One way to determine the common factors and greatest common factor is to find all the factors of the numbers and compare them.The factors of 21 are 1, 3, 7, and 21.The factors of 72 are 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, and 72.The common factors are 1 and 3. Therefore, the greatest common factor is 3.By inspection:21 is divisible by 3 and 7 only 72 is divisible by 2, 3, 4, 6, 12, 18, 26, 36The greatest common factor is 3
It is: 1
The number is 1.
3 can go into both these numbers 72/3= 24 21/3= 7
Only the number one.
It is: 1
7, 21, 8, 72, 9, ?
Nothing.. Because 21 is a Prime number
The HCF is 4
1 or 3 or 9
1 and 3.
2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71 that's as far up as it goes because 72 is a composite number not a prime number!
The number that goes into both 12 and 72 equally is 12. This is because 72 divided by 12 equals 6, so 12 is a common divisor of both numbers.