7 has two factors, one and itself. For them to be common, they need to be compared to another set of factors.
The Greatest Common Divisor (GCD) for 5 7 is 1
The numbers that go into both 28 and 70 are known as their common divisors. The common divisors of 28 are 1, 2, 4, 7, 14, and 28, while the common divisors of 70 are 1, 2, 5, 7, 10, 14, 35, and 70. The common divisors of both numbers are 1, 2, 7, and 14. Hence, the numbers that go into both 28 and 70 are 1, 2, 7, and 14.
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.
The numbers that go into both 15 and 70 are their common divisors. The divisors of 15 are 1, 3, 5, and 15, while the divisors of 70 are 1, 2, 5, 7, 10, 14, 35, and 70. The only common divisors between the two sets are 1 and 5. Therefore, the numbers that go into both 15 and 70 are 1 and 5.
231 has 8 divisors.
The divisors of 63 are: 1, 3, 7, 9, 21, 63.