11
21 and 32
The factors of 21 are 1, 3, 7 and 21. No two of them add up to 21.
The factors of 21 are 1, 3, 7, and 21. 3 - 1 = 2
21 has two prime factors.
21 and -10 are co-prime. They only have the factor "1" in common. If you mean what numbers add to -10, whose product is 21, that would be -3 and -7.
11
21 and 32
The factors of 21 are 1, 3, 7 and 21. No two of them add up to 21.
An HCF is the product of any common prime factors of two numbers. If two numbers have no common prime factors, then the HCF will be 1. For example, 10 and 21. The prime factors are 2x5 and 3x7. There is nothing in common, and so the HCF of 10 and 21 is 1. Two consecutive numbers will always have the HCF of 1.
10
The factors of 21 are: 1, 3, 7, 21 | The factors of 40 are: 1, 2, 4, 5, 8, 10, 20, 40
When the "factors" of a number are listed, the list is usually restricted to positive factors. Then there would be no answer to the question, because no group of positive numbers can add up to make zero.
The factors of 21 are 1, 3, 7, and 21. 3 - 1 = 2
If 21 is a factor of a number, then the factors of 21 must also be factors. So 3 and 7
Just 1.
Factors of 21: 1, 3, 7, 21 Factors of 30: 1, 2, 3, 5, 6, 10, 15, 30