The Greatest Common Divisor (GCD) for 5 7 is 1
The common divisors are: 1, 2, 7, 14.
2 divisors: 1, 7
The GCF is 7.
Since 7 is a prime, its only divisors are 1 and 7.
1, 2, 7, and 14 are common divisors (and common factors) of 28 and 42.
The divisors of 35 are: 1, 5, 7, 35.
The divisors of 21 are: 1, 3, 7, 21.
231 has 8 divisors.
The divisors of 147 are 1, 3, 7, 21, 49, 147.
The divisors of 63 are: 1, 3, 7, 9, 21, 63.
All numbers have divisors. Some numbers have some of the same divisors as other numbers. These are called common divisors. 3 is a divisor of 9. 3 is a divisor of 12. 3 is a common divisor of 9 and 12.